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Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Allowance for Noncovered Loan and Lease Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | [2] | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | $ 75,646 |  |  |  |  | $ 70,043 | $ 75,646 | $ 70,043 | $ 68,172
Charge-offs |  |  |  |  |  |  |  |  |  | (18,555) | (16,660) | (21,462)
Recoveries |  |  |  |  |  |  |  |  |  | 11,509 | 13,632 | 12,555
Provision for loan and lease losses | $ 1,789 | $ 3,153 | $ 3,975 | 5,852 | $ 3,327 | [1] | $ (648) | $ 3,177 | 2,775 | 14,769 | 8,631 | 10,778
Balance at the end of year | 83,369 |  |  |  | 75,646 |  |  |  |  | 83,369 | 75,646 | 70,043
Specific Reserve | 2,132 |  |  |  | 2,360 |  |  |  |  | 2,132 | 2,360 | 761
General Allocation | 81,237 |  |  |  | 73,286 |  |  |  |  | 81,237 | 73,286 | 69,282
Consumer [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 5,163 |  |  |  |  | 3,534 | 5,163 | 3,534 | 3,531
Charge-offs |  |  |  |  |  |  |  |  |  | (1,194) | (1,474) | (1,238)
Recoveries |  |  |  |  |  |  |  |  |  | 1,180 | 1,187 | 933
Provision for loan and lease losses |  |  |  |  |  |  |  |  |  | 152 | 1,916 | 308
Balance at the end of year | 5,301 |  |  |  | 5,163 |  |  |  |  | 5,301 | 5,163 | 3,534
Specific Reserve | 31 |  |  |  | 199 |  |  |  |  | 31 | 199 | 57
General Allocation | 5,270 |  |  |  | 4,964 |  |  |  |  | 5,270 | 4,964 | 3,477
Purchased Credit Impaired Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 6,907 |  |  |  |  | 10,515 | 6,907 | 10,515 | 13,726
Charge-offs |  |  |  |  |  |  |  |  |  | (4,862) | (6,812) | (9,944)
Recoveries |  |  |  |  |  |  |  |  |  | 3,847 | 6,187 | 7,004
Provision for loan and lease losses |  |  |  |  |  |  |  |  |  | (2,281) | (2,983) | (271)
Balance at the end of year | 3,611 |  |  |  | 6,907 |  |  |  |  | 3,611 | 6,907 | 10,515
Specific Reserve | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
General Allocation | 3,611 |  |  |  | 6,907 |  |  |  |  | 3,611 | 6,907 | 10,515
Unallocated Financing Receivables [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 0 |  |  |  |  | 226 | 0 | 226 | 569
Charge-offs |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Recoveries |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Provision for loan and lease losses |  |  |  |  |  |  |  |  |  | 1,053 | (226) | (343)
Balance at the end of year | 1,053 |  |  |  | 0 |  |  |  |  | 1,053 | 0 | 226
Specific Reserve | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
General Allocation | 1,053 |  |  |  | 0 |  |  |  |  | 1,053 | 0 | 226
Commercial business: Secured loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 29,341 |  |  |  |  | 36,050 | 29,341 | 36,050 | 32,321
Charge-offs |  |  |  |  |  |  |  |  |  | (11,560) | (7,524) | (9,993)
Recoveries |  |  |  |  |  |  |  |  |  | 3,024 | 4,283 | 2,483
Provision for loan and lease losses |  |  |  |  |  |  |  |  |  | 22,383 | (3,468) | 11,239
Balance at the end of year | 43,188 |  |  |  | 29,341 |  |  |  |  | 43,188 | 29,341 | 36,050
Specific Reserve | 2,023 |  |  |  | 1,867 |  |  |  |  | 2,023 | 1,867 | 664
General Allocation | 41,165 |  |  |  | 27,474 |  |  |  |  | 41,165 | 27,474 | 35,386
Commercial business: Unsecured loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 2,000 |  |  |  |  | 960 | 2,000 | 960 | 1,299
Charge-offs |  |  |  |  |  |  |  |  |  | (159) | (89) | (75)
Recoveries |  |  |  |  |  |  |  |  |  | 403 | 553 | 162
Provision for loan and lease losses |  |  |  |  |  |  |  |  |  | 382 | 576 | (426)
Balance at the end of year | 2,626 |  |  |  | 2,000 |  |  |  |  | 2,626 | 2,000 | 960
Specific Reserve | 0 |  |  |  | 3 |  |  |  |  | 0 | 3 | 0
General Allocation | 2,626 |  |  |  | 1,997 |  |  |  |  | 2,626 | 1,997 | 960
Real estate: One-to-four family residential [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 701 |  |  |  |  | 599 | 701 | 599 | 916
Charge-offs |  |  |  |  |  |  |  |  |  | 0 | (460) | (35)
Recoveries |  |  |  |  |  |  |  |  |  | 408 | 568 | 171
Provision for loan and lease losses |  |  |  |  |  |  |  |  |  | (516) | (6) | (453)
Balance at the end of year | 593 |  |  |  | 701 |  |  |  |  | 593 | 701 | 599
Specific Reserve | 8 |  |  |  | 103 |  |  |  |  | 8 | 103 | 12
General Allocation | 585 |  |  |  | 598 |  |  |  |  | 585 | 598 | 587
Real estate: Commercial and multifamily residential: Commercial land [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 4,265 |  |  |  |  | 1,797 | 4,265 | 1,797 | 1,178
Charge-offs |  |  |  |  |  |  |  |  |  | 0 | 0 | (26)
Recoveries |  |  |  |  |  |  |  |  |  | 99 | 53 | 2
Provision for loan and lease losses |  |  |  |  |  |  |  |  |  | (417) | 2,415 | 643
Balance at the end of year | 3,947 |  |  |  | 4,265 |  |  |  |  | 3,947 | 4,265 | 1,797
Specific Reserve | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
General Allocation | 3,947 |  |  |  | 4,265 |  |  |  |  | 3,947 | 4,265 | 1,797
Real estate: Commercial and multifamiIy residential: Income property [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 5,672 |  |  |  |  | 7,342 | 5,672 | 7,342 | 6,616
Charge-offs |  |  |  |  |  |  |  |  |  | (780) | (287) | 0
Recoveries |  |  |  |  |  |  |  |  |  | 912 | 498 | 966
Provision for loan and lease losses |  |  |  |  |  |  |  |  |  | (1,760) | (1,881) | (240)
Balance at the end of year | 4,044 |  |  |  | 5,672 |  |  |  |  | 4,044 | 5,672 | 7,342
Specific Reserve | 1 |  |  |  | 185 |  |  |  |  | 1 | 185 | 27
General Allocation | 4,043 |  |  |  | 5,487 |  |  |  |  | 4,043 | 5,487 | 7,315
Real estate: Commercial and multifamiIy residential: Owner occupied [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 5,459 |  |  |  |  | 6,439 | 5,459 | 6,439 | 5,550
Charge-offs |  |  |  |  |  |  |  |  |  | 0 | 0 | (63)
Recoveries |  |  |  |  |  |  |  |  |  | 20 | 124 | 434
Provision for loan and lease losses |  |  |  |  |  |  |  |  |  | (946) | (1,104) | 518
Balance at the end of year | 4,533 |  |  |  | 5,459 |  |  |  |  | 4,533 | 5,459 | 6,439
Specific Reserve | 69 |  |  |  | 3 |  |  |  |  | 69 | 3 | 0
General Allocation | 4,464 |  |  |  | 5,456 |  |  |  |  | 4,464 | 5,456 | 6,439
Real estate construction: One-to-four family residential: Land and acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 963 |  |  |  |  | 316 | 963 | 316 | 339
Charge-offs |  |  |  |  |  |  |  |  |  | 0 | (14) | (88)
Recoveries |  |  |  |  |  |  |  |  |  | 726 | 72 | 57
Provision for loan and lease losses |  |  |  |  |  |  |  |  |  | (1,140) | 589 | 8
Balance at the end of year | 549 |  |  |  | 963 |  |  |  |  | 549 | 963 | 316
Specific Reserve | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 1
General Allocation | 549 |  |  |  | 963 |  |  |  |  | 549 | 963 | 315
Real estate construction: One-to-four family residential: Residential construction [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 3,709 |  |  |  |  | 669 | 3,709 | 669 | 733
Charge-offs |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Recoveries |  |  |  |  |  |  |  |  |  | 890 | 106 | 234
Provision for loan and lease losses |  |  |  |  |  |  |  |  |  | 937 | 2,934 | (298)
Balance at the end of year | 5,536 |  |  |  | 3,709 |  |  |  |  | 5,536 | 3,709 | 669
Specific Reserve | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
General Allocation | 5,536 |  |  |  | 3,709 |  |  |  |  | 5,536 | 3,709 | 669
Real estate construction: Commercial and multifamily residential: Income property [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 7,053 |  |  |  |  | 404 | 7,053 | 404 | 388
Charge-offs |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Recoveries |  |  |  |  |  |  |  |  |  | 0 | 1 | 109
Provision for loan and lease losses |  |  |  |  |  |  |  |  |  | (1,269) | 6,648 | (93)
Balance at the end of year | 5,784 |  |  |  | 7,053 |  |  |  |  | 5,784 | 7,053 | 404
Specific Reserve | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
General Allocation | 5,784 |  |  |  | 7,053 |  |  |  |  | 5,784 | 7,053 | 404
Real estate construction: Commercial and multifamily residential: Owner occupied [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | $ 4,413 |  |  |  |  | $ 1,192 | 4,413 | 1,192 | 1,006
Charge-offs |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Recoveries |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Provision for loan and lease losses |  |  |  |  |  |  |  |  |  | (1,809) | 3,221 | 186
Balance at the end of year | 2,604 |  |  |  | 4,413 |  |  |  |  | 2,604 | 4,413 | 1,192
Specific Reserve | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
General Allocation | $ 2,604 |  |  |  | $ 4,413 |  |  |  |  | $ 2,604 | $ 4,413 | $ 1,192
[1] | During the fourth quarter of 2017, Columbia acquired Pacific Continental and also recorded a charge through provision for income taxes related to the re-measurement of our deferred tax assets pursuant to the newly enacted Tax Cuts and Jobs Act. See Note 2, “Business Combinations,” for further information regarding this acquisition. See Note 23, “Income Tax,” for further information regarding the re-measurement of our deferred tax assets.
[2] | During the third quarter of 2017, Columbia sold its merchant card services portfolio.

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