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FAIR VALUES OF FINANCIAL INSTRUMENTS - Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financial assets
Cash and cash equivalents	$ 385,691	$ 387,699
Securities available-for-sale	2,297,124	2,575,469
Federal Home Loan Bank and other bank stock	75,737	75,654
Loans held-for-sale	40,247	105,806
Loans and leases receivable, net of ALLL	6,960,050	6,601,767
Accrued interest receivable	37,138	35,355
Derivative assets	1,686	1,005
Financial liabilities
Deposits	6,902,576	7,063,613
Advances from Federal Home Loan Bank	1,800,336	1,695,039
Long term debt	176,103	180,560
Derivative liabilities	1,650	1,033
Accrued interest payable	8,279	7,321
Discontinued Operations, Disposed of by Sale | Banc Home Loan
Financial liabilities
Loans held-for-sale, carried at fair value	26,415	38,696
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets
Cash and cash equivalents	385,691	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 ALLL	0	0
Accrued interest receivable	37,138	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	8,279	7,321
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring
Financial assets
Loans held-for-sale	0	0
Significant Other Observable Inputs (Level 2)
Financial assets
Cash and cash equivalents	0	0
Securities available-for-sale	2,297,124	2,575,469
Federal Home Loan Bank and other bank stock	75,737	75,654
Loans held-for-sale	7,013	6,866
Loans and leases receivable, net of ALLL	0	0
Accrued interest receivable	0	0
Derivative assets	1,686	1,005
Financial liabilities
Deposits	0	0
Advances from Federal Home Loan Bank	1,800,336	1,695,039
Long term debt	176,103	180,560
Derivative liabilities	1,650	1,033
Accrued interest payable	0	0
Significant Other Observable Inputs (Level 2) | Recurring
Financial assets
Loans held-for-sale	5,515	6,359
Significant Other Observable Inputs (Level 2) | Recurring | Discontinued Operations, Disposed of by Sale | Banc Home Loan
Financial liabilities
Loans held-for-sale, carried at fair value	5,500	6,400
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	33,234	98,940
Loans and leases receivable, net of ALLL	6,960,050	6,601,767
Accrued interest receivable	0	0
Derivative assets	0	0
Financial liabilities
Deposits	6,902,576	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
Significant Unobservable Inputs (Level 3) | Recurring
Financial assets
Loans held-for-sale	33,234	98,940
Significant Unobservable Inputs (Level 3) | Recurring | Discontinued Operations, Disposed of by Sale | Banc Home Loan
Financial liabilities
Loans held-for-sale, carried at fair value	20,900	32,300
Carrying Value
Financial assets
Cash and cash equivalents	385,691	387,699
Securities available-for-sale	2,297,124	2,575,469
Federal Home Loan Bank and other bank stock	75,737	75,654
Loans held-for-sale	40,168	105,765
Loans and leases receivable, net of ALLL	6,979,326	6,610,074
Accrued interest receivable	37,138	35,355
Derivative assets	1,686	1,005
Financial liabilities
Deposits	7,135,794	7,292,903
Advances from Federal Home Loan Bank	1,805,000	1,695,000
Long term debt	173,017	172,941
Derivative liabilities	1,650	1,033
Accrued interest payable	8,279	7,321
Carrying Value | Recurring
Financial assets
Loans held-for-sale	$ 38,749	$ 105,299

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