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FAIR VALUES OF FINANCIAL INSTRUMENTS - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financial assets
Cash and cash equivalents	$ 391,592	$ 387,699
Securities available-for-sale	1,992,500	2,575,469
Federal Home Loan Bank and other bank stock	68,094	75,654
Loans held-for-sale	27,606	105,806
Loans and leases receivable, net of allowance	7,513,910	6,601,767
Accrued interest receivable	38,807	35,355
Derivative assets	1,534	1,005
Financial liabilities
Deposits	7,689,324	7,063,613
Advances from Federal Home Loan Bank	1,517,761	1,695,039
Long-term debt	174,059	180,560
Derivative liabilities	1,600	1,033
Accrued interest payable	13,253	7,321
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets
Cash and cash equivalents	391,592	387,699
Securities available-for-sale	0	0
Federal Home Loan Bank and other bank stock	0	0
Loans held-for-sale	0	0
Loans and leases receivable, net of allowance	0	0
Accrued interest receivable	38,807	35,355
Derivative assets	0	0
Financial liabilities
Deposits	0	0
Advances from Federal Home Loan Bank	0	0
Long-term debt	0	0
Derivative liabilities	0	0
Accrued interest payable	13,253	7,321
Significant Other Observable Inputs (Level 2)
Financial assets
Cash and cash equivalents	0	0
Securities available-for-sale	1,992,500	2,575,469
Federal Home Loan Bank and other bank stock	68,094	75,654
Loans held-for-sale	2,566	6,866
Loans and leases receivable, net of allowance	0	0
Accrued interest receivable	0	0
Derivative assets	1,534	1,005
Financial liabilities
Deposits	0	0
Advances from Federal Home Loan Bank	1,517,761	1,695,039
Long-term debt	174,059	180,560
Derivative liabilities	1,600	1,033
Accrued interest payable	0	0
Significant Unobservable Inputs (Level 3)
Financial assets
Cash and cash equivalents	0	0
Securities available-for-sale	0	0
Federal Home Loan Bank and other bank stock	0	0
Loans held-for-sale	25,040	98,940
Loans and leases receivable, net of allowance	7,513,910	6,601,767
Accrued interest receivable	0	0
Derivative assets	0	0
Financial liabilities
Deposits	7,689,324	7,063,613
Advances from Federal Home Loan Bank	0	0
Long-term debt	0	0
Derivative liabilities	0	0
Accrued interest payable	0	0
Carrying Value
Financial assets
Cash and cash equivalents	391,592	387,699
Securities available-for-sale	1,992,500	2,575,469
Federal Home Loan Bank and other bank stock	68,094	75,654
Loans held-for-sale	27,606	105,765
Loans and leases receivable, net of allowance	7,638,681	6,610,074
Accrued interest receivable	38,807	35,355
Derivative assets	1,534	1,005
Financial liabilities
Deposits	7,916,644	7,292,903
Advances from Federal Home Loan Bank	1,520,000	1,695,000
Long-term debt	173,174	172,941
Derivative liabilities	1,600	1,033
Accrued interest payable	13,253	7,321
Banc Home Loan | Discontinued Operations, Disposed of by Sale
Financial liabilities
Loans held-for-sale, carried at fair value	19,490	38,696
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets
Derivative assets	0
Financial liabilities
Derivative liabilities	0
Recurring | Significant Other Observable Inputs (Level 2)
Financial assets
Derivative assets	1,534
Financial liabilities
Derivative liabilities	1,600
Recurring | Significant Unobservable Inputs (Level 3)
Financial assets
Derivative assets	0
Financial liabilities
Derivative liabilities	0
Recurring | Carrying Value
Financial assets
Derivative assets	1,534
Financial liabilities
Derivative liabilities	1,600
Recurring | Banc Home Loan | Discontinued Operations, Disposed of by Sale | Significant Other Observable Inputs (Level 2)
Financial liabilities
Loans held-for-sale, carried at fair value	2,100	6,400
Recurring | Banc Home Loan | Discontinued Operations, Disposed of by Sale | Significant Unobservable Inputs (Level 3)
Financial liabilities
Loans held-for-sale, carried at fair value	$ 17,400	$ 32,300

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