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LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Allowance for loan losses
Total loans	$ 8,335,309	$ 6,825,847
Commercial loans | Construction
Allowance for loan losses
Total loans	319,452	324,282
Commercial loans | Commercial multifamily
Allowance for loan losses
Total loans	620,088	515,817
Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
Total loans	640,489	606,477
Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
Total loans	2,496,237	2,156,929
Commercial and industrial loans
Allowance for loan losses
Total loans	1,445,236	1,284,429
Commercial and industrial loans | Consumer other
Allowance for loan losses
Total loans	1,445,236
Residential real estate | Residential real estate
Allowance for loan losses
Total loans	2,312,447	1,489,248
Consumer loans | Home equity
Allowance for loan losses
Total loans	227,450	252,366
Consumer loans | Consumer other
Allowance for loan losses
Total loans	273,910	196,299
Total Past Due
Allowance for loan losses
Total loans	50,313	78,460
Total Past Due | Commercial loans | Construction
Allowance for loan losses
Total loans	0	0
Total Past Due | Commercial loans | Commercial multifamily
Allowance for loan losses
Total loans	214	575
Total Past Due | Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
Total loans	3,424	4,621
Total Past Due | Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
Total loans	334	35,122
Total Past Due | Commercial and industrial loans
Allowance for loan losses
Total loans		10,245
Total Past Due | Commercial and industrial loans | Consumer other
Allowance for loan losses
Total loans	21,269
Total Past Due | Residential real estate | Residential real estate
Allowance for loan losses
Total loans	17,552	20,808
Total Past Due | Consumer loans | Home equity
Allowance for loan losses
Total loans	2,344	2,524
Total Past Due | Consumer loans | Consumer other
Allowance for loan losses
Total loans	5,176	4,565
30-59 Days Past Due
Allowance for loan losses
Total loans	7,290	35,352
30-59 Days Past Due | Commercial loans | Construction
Allowance for loan losses
Total loans	0	0
30-59 Days Past Due | Commercial loans | Commercial multifamily
Allowance for loan losses
Total loans	0	82
30-59 Days Past Due | Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
Total loans	122	0
30-59 Days Past Due | Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
Total loans	143	25,420
30-59 Days Past Due | Commercial and industrial loans
Allowance for loan losses
Total loans		2,700
30-59 Days Past Due | Commercial and industrial loans | Consumer other
Allowance for loan losses
Total loans	1,173
30-59 Days Past Due | Residential real estate | Residential real estate
Allowance for loan losses
Total loans	3,694	5,529
30-59 Days Past Due | Consumer loans | Home equity
Allowance for loan losses
Total loans	168	258
30-59 Days Past Due | Consumer loans | Consumer other
Allowance for loan losses
Total loans	1,990	1,363
60-89 Days Past Due
Allowance for loan losses
Total loans	4,871	4,511
60-89 Days Past Due | Commercial loans | Construction
Allowance for loan losses
Total loans	0	0
60-89 Days Past Due | Commercial loans | Commercial multifamily
Allowance for loan losses
Total loans	214	306
60-89 Days Past Due | Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
Total loans	0	400
60-89 Days Past Due | Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
Total loans	0	653
60-89 Days Past Due | Commercial and industrial loans
Allowance for loan losses
Total loans		709
60-89 Days Past Due | Commercial and industrial loans | Consumer other
Allowance for loan losses
Total loans	1,438
60-89 Days Past Due | Residential real estate | Residential real estate
Allowance for loan losses
Total loans	2,134	2,015
60-89 Days Past Due | Consumer loans | Home equity
Allowance for loan losses
Total loans	57	108
60-89 Days Past Due | Consumer loans | Consumer other
Allowance for loan losses
Total loans	1,028	320
90 Days or Greater Past Due
Allowance for loan losses
Total loans	38,152	38,597
90 Days or Greater Past Due | Commercial loans | Construction
Allowance for loan losses
Total loans	0	0
90 Days or Greater Past Due | Commercial loans | Commercial multifamily
Allowance for loan losses
Total loans	0	187
90 Days or Greater Past Due | Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
Total loans	3,302	4,221
90 Days or Greater Past Due | Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
Total loans	191	9,049
90 Days or Greater Past Due | Commercial and industrial loans
Allowance for loan losses
Total loans		6,836
90 Days or Greater Past Due | Commercial and industrial loans | Consumer other
Allowance for loan losses
Total loans	18,658
90 Days or Greater Past Due | Residential real estate | Residential real estate
Allowance for loan losses
Total loans	11,724	13,264
90 Days or Greater Past Due | Consumer loans | Home equity
Allowance for loan losses
Total loans	2,119	2,158
90 Days or Greater Past Due | Consumer loans | Consumer other
Allowance for loan losses
Total loans	2,158	2,882
Current
Allowance for loan losses
Total loans	8,284,996	6,747,387
Current | Commercial loans | Construction
Allowance for loan losses
Total loans	319,452	324,282
Current | Commercial loans | Commercial multifamily
Allowance for loan losses
Total loans	619,874	515,242
Current | Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
Total loans	637,065	601,856
Current | Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
Total loans	2,495,903	2,121,807
Current | Commercial and industrial loans
Allowance for loan losses
Total loans		1,274,184
Current | Commercial and industrial loans | Consumer other
Allowance for loan losses
Total loans	1,423,967
Current | Residential real estate | Residential real estate
Allowance for loan losses
Total loans	2,294,895	1,468,440
Current | Consumer loans | Home equity
Allowance for loan losses
Total loans	225,106	249,842
Current | Consumer loans | Consumer other
Allowance for loan losses
Total loans	$ 268,734	$ 191,734

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