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Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Analysis of Credit Quality of the Loan Portfolio) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: allowance for loan and lease losses | $ 69,304 | $ 69,264 | $ 68,172 | $ 69,257 | $ 70,234 | $ 69,569
Loans, net | 6,037,839 |  | 5,746,855 |  |  |
Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 5,946,036 |  | 5,634,121 |  |  |
Less: allowance for loan and lease losses | 57,523 |  | 54,446 |  |  |
Loans, net | 5,888,513 |  | 5,579,675 |  |  |
Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 175,598 |  | 197,350 |  |  |
Acquisition Accounting Valuation Discount on Purchased Credit Impaired Loans | 14,491 |  | 16,444 |  |  |
Less: allowance for loan and lease losses | 11,781 |  | 13,726 |  |  |
Loans, net | 149,326 |  | 167,180 |  |  |
Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 5,755,775 |  | 5,461,639 |  |  |
Pass [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 163,104 |  | 178,904 |  |  |
Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 106,235 |  | 80,599 |  |  |
Special Mention [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 96 |  | 362 |  |  |
Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 84,026 |  | 91,883 |  |  |
Substandard [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 12,398 |  | 18,084 |  |  |
Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Doubtful [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Secured Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: allowance for loan and lease losses | 31,808 | 32,114 | 32,321 | 27,708 | 25,761 | 25,923
Secured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 2,417,421 |  | 2,262,692 |  |  |
Secured Loans [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 27,529 |  | 37,564 |  |  |
Secured Loans [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 2,297,510 |  | 2,146,729 |  |  |
Secured Loans [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 24,135 |  | 31,468 |  |  |
Secured Loans [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 76,014 |  | 59,746 |  |  |
Secured Loans [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 96 |  | 101 |  |  |
Secured Loans [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 43,897 |  | 56,217 |  |  |
Secured Loans [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 3,298 |  | 5,995 |  |  |
Secured Loans [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Secured Loans [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Secured Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Secured Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Unsecured Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: allowance for loan and lease losses | 1,265 | 1,300 | 1,299 | 857 | 1,012 | 927
Unsecured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 96,890 |  | 94,948 |  |  |
Unsecured Loans [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 920 |  | 1,220 |  |  |
Unsecured Loans [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 96,551 |  | 93,347 |  |  |
Unsecured Loans [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 919 |  | 1,218 |  |  |
Unsecured Loans [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 277 |  | 278 |  |  |
Unsecured Loans [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Unsecured Loans [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 62 |  | 1,323 |  |  |
Unsecured Loans [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 1 |  | 2 |  |  |
Unsecured Loans [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Unsecured Loans [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Unsecured Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Unsecured Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
One-to-Four Family Residential [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: allowance for loan and lease losses | 674 | 654 | 916 | 1,355 | 1,364 | 2,281
One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 170,172 |  | 173,436 |  |  |
One-to-Four Family Residential [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 23,708 |  | 27,195 |  |  |
One-to-Four Family Residential [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 168,559 |  | 171,945 |  |  |
One-to-Four Family Residential [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 21,966 |  | 25,018 |  |  |
One-to-Four Family Residential [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 514 |  | 52 |  |  |
One-to-Four Family Residential [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
One-to-Four Family Residential [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 1,099 |  | 1,439 |  |  |
One-to-Four Family Residential [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 1,742 |  | 2,177 |  |  |
One-to-Four Family Residential [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
One-to-Four Family Residential [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
One-to-Four Family Residential [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
One-to-Four Family Residential [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Commercial Land [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: allowance for loan and lease losses | 1,422 | 1,262 | 1,178 | 1,581 | 827 | 799
Commercial Land [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 234,207 |  | 213,158 |  |  |
Commercial Land [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 8,272 |  | 8,898 |  |  |
Commercial Land [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 227,322 |  | 207,768 |  |  |
Commercial Land [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 7,877 |  | 8,234 |  |  |
Commercial Land [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 6,544 |  | 4,966 |  |  |
Commercial Land [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Commercial Land [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 341 |  | 424 |  |  |
Commercial Land [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 395 |  | 664 |  |  |
Commercial Land [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Commercial Land [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Commercial Land [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Commercial Land [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Income Property Multifamily [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: allowance for loan and lease losses | 8,046 | 7,402 | 6,616 | 8,197 | 8,440 | 9,159
Income Property Multifamily [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 1,372,107 |  | 1,310,779 |  |  |
Income Property Multifamily [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 35,389 |  | 42,342 |  |  |
Income Property Multifamily [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 1,344,005 |  | 1,296,043 |  |  |
Income Property Multifamily [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 30,893 |  | 36,426 |  |  |
Income Property Multifamily [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 17,095 |  | 5,889 |  |  |
Income Property Multifamily [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Income Property Multifamily [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 11,007 |  | 8,847 |  |  |
Income Property Multifamily [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 4,496 |  | 5,916 |  |  |
Income Property Multifamily [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Income Property Multifamily [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Income Property Multifamily [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Income Property Multifamily [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Owner Occupied [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: allowance for loan and lease losses | 6,336 | 6,086 | 5,550 | 5,801 | 5,612 | 5,007
Owner Occupied [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 1,024,446 |  | 946,316 |  |  |
Owner Occupied [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 57,540 |  | 55,068 |  |  |
Owner Occupied [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 1,005,059 |  | 918,986 |  |  |
Owner Occupied [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 55,866 |  | 53,071 |  |  |
Owner Occupied [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 5,791 |  | 9,668 |  |  |
Owner Occupied [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 261 |  |  |
Owner Occupied [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 13,596 |  | 17,662 |  |  |
Owner Occupied [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 1,674 |  | 1,736 |  |  |
Owner Occupied [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Owner Occupied [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Owner Occupied [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Owner Occupied [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Land And Acquisition [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: allowance for loan and lease losses | 587 | 640 | 339 | 497 | 1,026 | 1,197
Land And Acquisition [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 10,708 |  | 14,750 |  |  |
Land And Acquisition [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 938 |  | 1,565 |  |  |
Land And Acquisition [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 10,708 |  | 14,388 |  |  |
Land And Acquisition [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 794 |  | 1,086 |  |  |
Land And Acquisition [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Land And Acquisition [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Land And Acquisition [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 362 |  |  |
Land And Acquisition [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 144 |  | 479 |  |  |
Land And Acquisition [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Land And Acquisition [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Land And Acquisition [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Land And Acquisition [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Residential Construction [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: allowance for loan and lease losses | 1,376 | 1,449 | 733 | 958 | 1,790 | 1,860
Residential Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 117,864 |  | 120,375 |  |  |
Residential Construction [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 722 |  | 761 |  |  |
Residential Construction [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 117,022 |  | 119,243 |  |  |
Residential Construction [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 401 |  | 427 |  |  |
Residential Construction [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Residential Construction [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Residential Construction [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 842 |  | 1,132 |  |  |
Residential Construction [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 321 |  | 334 |  |  |
Residential Construction [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Residential Construction [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Residential Construction [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Residential Construction [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Income Property Multifamily Construction [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: allowance for loan and lease losses | 904 | 715 | 388 | 407 | 827 | 622
Income Property Multifamily Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 78,867 |  | 83,634 |  |  |
Income Property Multifamily Construction [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 1,263 |  | 1,303 |  |  |
Income Property Multifamily Construction [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 78,867 |  | 83,634 |  |  |
Income Property Multifamily Construction [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 1,263 |  | 1,303 |  |  |
Income Property Multifamily Construction [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Income Property Multifamily Construction [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Income Property Multifamily Construction [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Income Property Multifamily Construction [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Income Property Multifamily Construction [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Income Property Multifamily Construction [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Income Property Multifamily Construction [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Income Property Multifamily Construction [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Owner Occupied Construction [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: allowance for loan and lease losses | 1,384 | 1,210 | 1,006 | 441 | 499 | 434
Owner Occupied Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 104,896 |  | 81,671 |  |  |
Owner Occupied Construction [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 520 |  | 531 |  |  |
Owner Occupied Construction [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 100,341 |  | 81,270 |  |  |
Owner Occupied Construction [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 520 |  | 531 |  |  |
Owner Occupied Construction [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Owner Occupied Construction [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Owner Occupied Construction [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 4,555 |  | 401 |  |  |
Owner Occupied Construction [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Owner Occupied Construction [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Owner Occupied Construction [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Owner Occupied Construction [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Owner Occupied Construction [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: allowance for loan and lease losses | 3,560 | $ 3,368 | 3,531 | $ 3,182 | $ 2,835 | $ 3,180
Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 318,458 |  | 332,362 |  |  |
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 18,797 |  | 20,903 |  |  |
Consumer Portfolio Segment [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 309,831 |  | 328,286 |  |  |
Consumer Portfolio Segment [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 18,470 |  | 20,122 |  |  |
Consumer Portfolio Segment [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Consumer Portfolio Segment [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Consumer Portfolio Segment [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 8,627 |  | 4,076 |  |  |
Consumer Portfolio Segment [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 327 |  | 781 |  |  |
Consumer Portfolio Segment [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Consumer Portfolio Segment [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Consumer Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 0 |  |  |
Consumer Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | $ 0 |  | $ 0 |  |  |

X
- Definition Acquisition Accounting Valuation Discount on Purchased Credit Impaired Loans + References No definition available. + Details
Name: | colb_AcquisitionAccountingValuationDiscountonPurchasedCreditImpairedLoans
Namespace Prefix: | colb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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