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LOANS AND CREDIT QUALITY - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	$ 5,354,257	$ 5,244,180
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	4,244,615	3,924,304
Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	886,106	1,112,979
Commercial loans | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	450,350	467,256
Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	435,756	645,723
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	1,109,642	1,319,876
Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	793,927	915,123
Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	315,715	404,753
Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	10,822	12,593
Total | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	6,942	10,136
Total | Commercial loans | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	3,874	4,922
Total | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	3,068	5,214
Total | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	3,880	2,457
Total | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,957	2,457
Total | Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	923
Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	1,498	3,576
Land | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	1,498	3,576
Land | Commercial loans | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	1,111	1,789
Land | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	387	1,787
Land | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Land | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Land | Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0
1-4 Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	3,880	3,002
1-4 Family | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	545
1-4 Family | Commercial loans | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
1-4 Family | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	545
1-4 Family | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	3,880	2,457
1-4 Family | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,957	2,457
1-4 Family | Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	923
Non-residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,763	3,133
Non-residential real estate | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,763	3,133
Non-residential real estate | Commercial loans | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,763	3,133
Non-residential real estate | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Non-residential real estate | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Non-residential real estate | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Non-residential real estate | Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0
Other non-real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,681	2,882
Other non-real estate | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,681	2,882
Other non-real estate | Commercial loans | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Other non-real estate | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,681	2,882
Other non-real estate | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Other non-real estate | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	$ 0
Other non-real estate | Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	$ 0

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Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
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