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LOANS AND CREDIT QUALITY - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	$ 5,392,523	$ 5,244,180
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	4,245,657	3,924,304
Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	1,032,626	1,112,979
Commercial loans | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	457,504	467,256
Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	575,122	645,723
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	1,146,866	1,319,876
Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	812,287	915,123
Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	334,579	404,753
Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	12,879	12,593
Total | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	9,614	10,136
Total | Commercial loans | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	4,909	4,922
Total | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	4,705	5,214
Total | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	3,265	2,457
Total | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,361	2,457
Total | Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	904
Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	3,326	3,576
Land | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	3,326	3,576
Land | Commercial loans | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	1,789	1,789
Land | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	1,537	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	3,810	3,002
1-4 Family | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	545	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	545	545
1-4 Family | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	3,265	2,457
1-4 Family | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,361	2,457
1-4 Family | Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	904
Non-residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	3,120	3,133
Non-residential real estate | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	3,120	3,133
Non-residential real estate | Commercial loans | Owner occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	3,120	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	2,623	2,882
Other non-real estate | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,623	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	2,623	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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