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LOANS AND CREDIT QUALITY - Activity in Allowance for Credit Losses by Loan Portfolio (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounting Standards Update [Extensible List]     Accounting Standards Update 2016-13 [Member] Accounting Standards Update 2016-13 [Member]
Allowance for credit losses by loan portfolio        
Beginning balance $ 59,897 $ 65,000 $ 64,294 $ 41,772
Impact of ASC 326 adoption 54,516 64,892 54,516 64,892
Charge-offs (470) (489) (675) (938)
Recoveries 437 108 761 582
Provision (5,348) 273 (9,864) 21,633
Ending balance 54,516 64,892 54,516 64,892
Cumulative Effect, Period of Adoption, Adjustment        
Allowance for credit losses by loan portfolio        
Beginning balance       1,843
Impact of ASC 326 adoption        
Commercial loans | Real Estate Sector        
Allowance for credit losses by loan portfolio        
Beginning balance 25,544 24,347 27,935 22,535
Impact of ASC 326 adoption 23,841 28,136 23,841 28,136
Charge-offs 0 0 0 0
Recoveries 0 0 0 163
Provision (1,703) 3,789 (4,094) 6,749
Ending balance 23,841 28,136 23,841 28,136
Commercial loans | Real Estate Sector | Cumulative Effect, Period of Adoption, Adjustment        
Allowance for credit losses by loan portfolio        
Beginning balance       (1,311)
Impact of ASC 326 adoption        
Commercial loans | Commercial and Industrial Sector        
Allowance for credit losses by loan portfolio        
Beginning balance 21,392 21,457 22,037 6,554
Impact of ASC 326 adoption 19,758 24,032 19,758 24,032
Charge-offs (116) (447) (116) (590)
Recoveries 24 24 122 72
Provision (1,542) 2,998 (2,285) 19,945
Ending balance 19,758 24,032 19,758 24,032
Commercial loans | Commercial and Industrial Sector | Cumulative Effect, Period of Adoption, Adjustment        
Allowance for credit losses by loan portfolio        
Beginning balance       (1,949)
Impact of ASC 326 adoption        
Commercial loans | Non-owner occupied commercial real estate        
Allowance for credit losses by loan portfolio        
Beginning balance 9,077 7,325 8,845 7,245
Impact of ASC 326 adoption 9,636 8,923 9,636 8,923
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision 559 1,598 791 5,070
Ending balance 9,636 8,923 9,636 8,923
Commercial loans | Non-owner occupied commercial real estate | Cumulative Effect, Period of Adoption, Adjustment        
Allowance for credit losses by loan portfolio        
Beginning balance       (3,392)
Impact of ASC 326 adoption        
Commercial loans | Multifamily        
Allowance for credit losses by loan portfolio        
Beginning balance 7,245 5,387 6,072 7,015
Impact of ASC 326 adoption 5,457 4,871 5,457 4,871
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision (1,788) (516) (615) 833
Ending balance 5,457 4,871 5,457 4,871
Commercial loans | Multifamily | Cumulative Effect, Period of Adoption, Adjustment        
Allowance for credit losses by loan portfolio        
Beginning balance       (2,977)
Impact of ASC 326 adoption        
Commercial loans | Multifamily construction        
Allowance for credit losses by loan portfolio        
Beginning balance 500 3,811 4,903 2,848
Impact of ASC 326 adoption 1,044 5,920 1,044 5,920
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision 544 2,109 (3,859) 2,379
Ending balance 1,044 5,920 1,044 5,920
Commercial loans | Multifamily construction | Cumulative Effect, Period of Adoption, Adjustment        
Allowance for credit losses by loan portfolio        
Beginning balance       693
Impact of ASC 326 adoption        
Commercial loans | Commercial real estate construction        
Allowance for credit losses by loan portfolio        
Beginning balance 2,022 440 1,670 624
Impact of ASC 326 adoption 351 1,709 351 1,709
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision (1,671) 1,269 (1,319) 1,200
Ending balance 351 1,709 351 1,709
Commercial loans | Commercial real estate construction | Cumulative Effect, Period of Adoption, Adjustment        
Allowance for credit losses by loan portfolio        
Beginning balance       (115)
Impact of ASC 326 adoption        
Commercial loans | Single family construction        
Allowance for credit losses by loan portfolio        
Beginning balance 5,653 5,869 5,130 3,800
Impact of ASC 326 adoption 6,291 5,507 6,291 5,507
Charge-offs 0 0 0 0
Recoveries 0   0 163
Provision 638 (362) 1,161 (2,736)
Ending balance 6,291 5,507 6,291 5,507
Commercial loans | Single family construction | Cumulative Effect, Period of Adoption, Adjustment        
Allowance for credit losses by loan portfolio        
Beginning balance       4,280
Impact of ASC 326 adoption        
Commercial loans | Single family construction to permanent        
Allowance for credit losses by loan portfolio        
Beginning balance 1,047 1,515 1,315 1,003
Impact of ASC 326 adoption 1,062 1,206 1,062 1,206
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision 15 (309) (253) 3
Ending balance 1,062 1,206 1,062 1,206
Commercial loans | Single family construction to permanent | Cumulative Effect, Period of Adoption, Adjustment        
Allowance for credit losses by loan portfolio        
Beginning balance       200
Impact of ASC 326 adoption        
Commercial loans | Owner occupied commercial real estate        
Allowance for credit losses by loan portfolio        
Beginning balance 5,518 5,641 4,994 3,639
Impact of ASC 326 adoption 5,285 5,688 5,285 5,688
Charge-offs 0 0 0
Recoveries 0 0 0 0
Provision (233) 47 291 4,508
Ending balance 5,285 5,688 5,285 5,688
Commercial loans | Owner occupied commercial real estate | Cumulative Effect, Period of Adoption, Adjustment        
Allowance for credit losses by loan portfolio        
Beginning balance       (2,459)
Impact of ASC 326 adoption        
Commercial loans | Commercial business        
Allowance for credit losses by loan portfolio        
Beginning balance 15,874 15,816 17,043 2,915
Impact of ASC 326 adoption 14,473 18,344 14,473 18,344
Charge-offs (116) (447) (116) (590)
Recoveries 24 24 122 72
Provision (1,309) 2,951 (2,576) 15,437
Ending balance 14,473 18,344 14,473 18,344
Commercial loans | Commercial business | Cumulative Effect, Period of Adoption, Adjustment        
Allowance for credit losses by loan portfolio        
Beginning balance       510
Impact of ASC 326 adoption        
Consumer loans        
Allowance for credit losses by loan portfolio        
Beginning balance 12,961 19,196 14,322 12,683
Impact of ASC 326 adoption 10,917 12,724 10,917 12,724
Charge-offs (354) (42) (559) (348)
Recoveries 413 84 639 347
Provision (2,103) (6,514) (3,485) (5,061)
Ending balance 10,917 12,724 10,917 12,724
Consumer loans | Cumulative Effect, Period of Adoption, Adjustment        
Allowance for credit losses by loan portfolio        
Beginning balance       5,103
Impact of ASC 326 adoption        
Consumer loans | Single family        
Allowance for credit losses by loan portfolio        
Beginning balance 7,163 8,070 6,906 6,450
Impact of ASC 326 adoption 5,757 6,720 5,757 6,720
Charge-offs (13) (3) (127) (3)
Recoveries 33 2 155 56
Provision (1,426) (1,349) (1,177) (251)
Ending balance 5,757 6,720 5,757 6,720
Consumer loans | Single family | Cumulative Effect, Period of Adoption, Adjustment        
Allowance for credit losses by loan portfolio        
Beginning balance       468
Impact of ASC 326 adoption        
Consumer loans | Home equity and other        
Allowance for credit losses by loan portfolio        
Beginning balance 5,798 11,126 7,416 6,233
Impact of ASC 326 adoption 5,160 6,004 5,160 6,004
Charge-offs (341) (39) (432) (345)
Recoveries 380 82 484 291
Provision (677) (5,165) (2,308) (4,810)
Ending balance $ 5,160 $ 6,004 $ 5,160 6,004
Consumer loans | Home equity and other | Cumulative Effect, Period of Adoption, Adjustment        
Allowance for credit losses by loan portfolio        
Beginning balance       $ 4,635
Impact of ASC 326 adoption