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LOANS AND CREDIT QUALITY - Activity in Allowance for Credit Losses by Loan Portfolio (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accounting Standards Update [Extensible List]         us-gaap:AccountingStandardsUpdate201613Member
Allowance for credit losses by loan portfolio          
Beginning balance $ 64,047 $ 58,299 $ 64,294 $ 41,772  
Impact of ASC 326 adoption 59,897 65,000 59,897 65,000 $ 41,772
Charge-offs (79) (88) (205) (448)  
Recoveries 74 84 324 473  
(Reversal of) Provision (4,145) 6,705 (4,516) 21,360  
Ending balance 59,897 65,000 59,897 65,000 41,772
Cumulative Effect, Period of Adoption, Adjustment          
Allowance for credit losses by loan portfolio          
Beginning balance       1,843  
Impact of ASC 326 adoption         1,843
Ending balance         1,843
Commercial loans | Real Estate Sector          
Allowance for credit losses by loan portfolio          
Beginning balance 28,162 24,983 27,935 22,535  
Impact of ASC 326 adoption 25,544 24,347 25,544 24,347 22,535
Charge-offs 0 0 0 0  
Recoveries 0 0 0 163  
(Reversal of) Provision (2,618) (636) (2,391) 2,960  
Ending balance 25,544 24,347 25,544 24,347 22,535
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         (1,311)
Ending balance         (1,311)
Commercial loans | Commercial and Industrial Sector          
Allowance for credit losses by loan portfolio          
Beginning balance 22,371 12,321 22,037 6,554  
Impact of ASC 326 adoption 21,392 21,457 21,392 21,457 6,554
Charge-offs 0 0 0 (143)  
Recoveries 24 24 98 48  
(Reversal of) Provision (1,003) 9,112 (743) 16,947  
Ending balance 21,392 21,457 21,392 21,457 6,554
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         (1,949)
Ending balance         (1,949)
Commercial loans | Non-owner occupied commercial real estate          
Allowance for credit losses by loan portfolio          
Beginning balance 9,218 9,021 8,845 7,245  
Impact of ASC 326 adoption 9,077 7,325 9,077 7,325 7,245
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
(Reversal of) Provision (141) (1,696) 232 3,472  
Ending balance 9,077 7,325 9,077 7,325 7,245
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         (3,392)
Ending balance         (3,392)
Commercial loans | Multifamily          
Allowance for credit losses by loan portfolio          
Beginning balance 6,969 4,265 6,072 7,015  
Impact of ASC 326 adoption 7,245 5,387 7,245 5,387 7,015
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
(Reversal of) Provision 276 1,122 1,173 1,349  
Ending balance 7,245 5,387 7,245 5,387 7,015
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         (2,977)
Ending balance         (2,977)
Commercial loans | Multifamily construction          
Allowance for credit losses by loan portfolio          
Beginning balance 3,936 3,218 4,903 2,848  
Impact of ASC 326 adoption 500 3,811 500 3,811 2,848
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
(Reversal of) Provision (3,436) 593 (4,403) 270  
Ending balance 500 3,811 500 3,811 2,848
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         693
Ending balance         693
Commercial loans | Commercial real estate construction          
Allowance for credit losses by loan portfolio          
Beginning balance 1,908 382 1,670 624  
Impact of ASC 326 adoption 2,022 440 2,022 440 624
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
(Reversal of) Provision 114 58 352 (69)  
Ending balance 2,022 440 2,022 440 624
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         (115)
Ending balance         (115)
Commercial loans | Single family construction          
Allowance for credit losses by loan portfolio          
Beginning balance 5,007 6,585 5,130 3,800  
Impact of ASC 326 adoption 5,653 5,869 5,653 5,869 3,800
Charge-offs 0 0 0 0  
Recoveries 0   0 163  
(Reversal of) Provision 646 (716) 523 (2,374)  
Ending balance 5,653 5,869 5,653 5,869 3,800
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         4,280
Ending balance         4,280
Commercial loans | Single family construction to permanent          
Allowance for credit losses by loan portfolio          
Beginning balance 1,124 1,512 1,315 1,003  
Impact of ASC 326 adoption 1,047 1,515 1,047 1,515 1,003
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
(Reversal of) Provision (77) 3 (268) 312  
Ending balance 1,047 1,515 1,047 1,515 1,003
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         200
Ending balance         200
Commercial loans | Owner occupied commercial real estate          
Allowance for credit losses by loan portfolio          
Beginning balance 5,266 4,160 4,994 3,639  
Impact of ASC 326 adoption 5,518 5,641 5,518 5,641 3,639
Charge-offs 0 0  
Recoveries 0 0 0 0  
(Reversal of) Provision 252 1,481 524 4,461  
Ending balance 5,518 5,641 5,518 5,641 3,639
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         (2,459)
Ending balance         (2,459)
Commercial loans | Commercial business          
Allowance for credit losses by loan portfolio          
Beginning balance 17,105 8,161 17,043 2,915  
Impact of ASC 326 adoption 15,874 15,816 15,874 15,816 2,915
Charge-offs 0   0 (143)  
Recoveries 24 24 98 48  
(Reversal of) Provision (1,255) 7,631 (1,267) 12,486  
Ending balance 15,874 15,816 15,874 15,816 2,915
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         510
Ending balance         510
Consumer loans          
Allowance for credit losses by loan portfolio          
Beginning balance 13,514 20,995 14,322 12,683  
Impact of ASC 326 adoption 12,961 19,196 12,961 19,196 12,683
Charge-offs (79) (88) (205) (305)  
Recoveries 50 60 226 262  
(Reversal of) Provision (524) (1,771) (1,382) 1,453  
Ending balance 12,961 19,196 12,961 19,196 12,683
Consumer loans | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for credit losses by loan portfolio          
Beginning balance       5,103  
Impact of ASC 326 adoption         5,103
Ending balance         5,103
Consumer loans | Single family          
Allowance for credit losses by loan portfolio          
Beginning balance 6,735 8,587 6,906 6,450  
Impact of ASC 326 adoption 7,163 8,070 7,163 8,070 6,450
Charge-offs (44) 0 (114) 0  
Recoveries 2 1 122 54  
(Reversal of) Provision 470 (518) 249 1,098  
Ending balance 7,163 8,070 7,163 8,070 6,450
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         468
Ending balance         468
Consumer loans | Home equity and other          
Allowance for credit losses by loan portfolio          
Beginning balance 6,779 12,408 7,416 6,233  
Impact of ASC 326 adoption 5,798 11,126 5,798 11,126 6,233
Charge-offs (35) (88) (91) (305)  
Recoveries 48 59 104 208  
(Reversal of) Provision (994) (1,253) (1,631) 355  
Ending balance $ 5,798 $ 11,126 $ 5,798 11,126 6,233
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         4,635
Ending balance         $ 4,635