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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 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Less: allowance for loan and lease losses | $ 83,787 | $ 80,150 | $ 75,646 | $ 71,616 | $ 72,984 | $ 70,043
Loans, net | 8,430,530 |  | 8,283,011 |  |  |
Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 8,418,381 |  | 8,245,987 |  |  |
Less: allowance for loan and lease losses | 79,770 |  | 68,739 |  |  |
Loans, net | 8,338,611 |  | 8,177,248 |  |  |
Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 102,781 |  | 120,758 |  |  |
Acquisition Accounting Valuation Discount on Purchased Credit Impaired Loans | 6,845 |  | 8,088 |  |  |
Less: allowance for loan and lease losses | 4,017 |  | 6,907 |  |  |
Loans, net | 91,919 |  | 105,763 |  |  |
Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 8,085,970 |  | 7,926,539 |  |  |
Pass [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 98,991 |  | 117,307 |  |  |
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 | 134,098 |  | 95,551 |  |  |
Special Mention [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 0 |  | 349 |  |  |
Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 198,313 |  | 223,897 |  |  |
Substandard [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 3,790 |  | 3,102 |  |  |
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 | 43,182 | 40,350 | 29,341 | 37,758 | 39,539 | 36,050
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 | 3,420,311 |  | 3,235,661 |  |  |
Secured Loans [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 10,679 |  | 12,641 |  |  |
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 | 3,202,147 |  | 3,049,031 |  |  |
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 | 9,732 |  | 11,918 |  |  |
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 | 83,986 |  | 64,600 |  |  |
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 | 0 |  | 0 |  |  |
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 | 134,178 |  | 122,030 |  |  |
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 | 947 |  | 723 |  |  |
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 | 2,423 | 2,443 | 2,000 | 987 | 1,147 | 960
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 | 118,919 |  | 124,175 |  |  |
Unsecured Loans [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 924 |  | 1,112 |  |  |
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 | 118,885 |  | 123,621 |  |  |
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 | 824 |  | 1,045 |  |  |
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 | 33 |  | 0 |  |  |
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 | 1 |  | 554 |  |  |
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 | 100 |  | 67 |  |  |
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 | 372 | 461 | 701 | 671 | 628 | 599
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 | 231,311 |  | 186,554 |  |  |
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 | 10,243 |  | 14,610 |  |  |
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 | 229,704 |  | 183,312 |  |  |
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 | 10,021 |  | 13,817 |  |  |
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 | 0 |  | 1,186 |  |  |
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 | 1,607 |  | 2,056 |  |  |
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 | 222 |  | 793 |  |  |
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 | 3,199 | 3,278 | 4,265 | 2,304 | 2,356 | 1,797
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 | 281,238 |  | 295,981 |  |  |
Commercial Land [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 10,583 |  | 9,809 |  |  |
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 | 272,838 |  | 283,673 |  |  |
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 | 10,583 |  | 9,460 |  |  |
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 | 3,423 |  | 5,204 |  |  |
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 |  | 349 |  |  |
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 | 4,977 |  | 7,104 |  |  |
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 | 0 |  | 0 |  |  |
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 | 4,012 | 4,102 | 5,672 | 7,104 | 6,854 | 7,342
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 | 1,887,690 |  | 1,906,336 |  |  |
Income Property Multifamily [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 22,342 |  | 26,016 |  |  |
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 | 1,857,338 |  | 1,857,832 |  |  |
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 | 20,444 |  | 25,981 |  |  |
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 | 19,474 |  | 17,181 |  |  |
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 | 10,878 |  | 31,323 |  |  |
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 | 1,898 |  | 35 |  |  |
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 | 4,675 | 4,356 | 5,459 | 6,822 | 6,512 | 6,439
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 | 1,597,269 |  | 1,599,986 |  |  |
Owner Occupied [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 37,419 |  | 43,386 |  |  |
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 | 1,532,093 |  | 1,546,775 |  |  |
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 | 37,042 |  | 42,617 |  |  |
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 | 27,182 |  | 7,380 |  |  |
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 |  | 0 |  |  |
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 | 37,994 |  | 45,831 |  |  |
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 | 377 |  | 769 |  |  |
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 | 688 | 848 | 963 | 292 | 361 | 316
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 | 5,963 |  | 9,907 |  |  |
Land And Acquisition [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 159 |  | 177 |  |  |
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 | 5,645 |  | 9,882 |  |  |
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 | 155 |  | 169 |  |  |
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 | 318 |  | 25 |  |  |
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 | 4 |  | 8 |  |  |
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 | 5,233 | 4,572 | 3,709 | 1,111 | 1,377 | 669
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 | 204,628 |  | 189,691 |  |  |
Residential Construction [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] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 204,628 |  | 187,863 |  |  |
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 | 0 |  | 0 |  |  |
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 | 0 |  | 1,828 |  |  |
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 | 0 |  | 0 |  |  |
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 | 7,940 | 7,367 | 7,053 | 1,264 | 985 | 404
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 | 253,636 |  | 293,028 |  |  |
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 | 552 |  | 595 |  |  |
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 | 253,636 |  | 293,028 |  |  |
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 | 552 |  | 595 |  |  |
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 | 2,437 | 2,299 | 4,413 | 1,295 | 1,382 | 1,192
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 | 90,511 |  | 72,443 |  |  |
Owner Occupied Construction [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] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 86,461 |  | 68,393 |  |  |
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 | 0 |  | 0 |  |  |
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 | 4,050 |  | 4,050 |  |  |
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 | 5,023 | $ 5,292 | 5,163 | $ 3,673 | $ 3,551 | $ 3,534
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 | 326,905 |  | 332,225 |  |  |
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross, Carrying Amount | 9,880 |  | 12,412 |  |  |
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 | 322,595 |  | 323,129 |  |  |
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 | 9,638 |  | 11,705 |  |  |
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 | 4,310 |  | 9,096 |  |  |
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 | 242 |  | 707 |  |  |
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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