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FAIR VALUES OF FINANCIAL INSTRUMENTS - Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Financial assets    
Cash and cash equivalents $ 611,826 $ 439,510
Time deposits in financial institutions 1,000 1,000
Securities available-for-sale 2,755,664 2,381,488
Securities held-to-maturity   899,743
Federal Home Loan Bank and other bank stock 67,063 67,842
Loans held-for-sale 109,756 711,188
Loans and leases receivable, net of ALLL 6,195,299 5,999,791
Accrued interest receivable 34,798 36,382
Derivative assets 1,112 17,968
Financial liabilities    
Deposits 7,198,216 8,908,406
Advances from Federal Home Loan Bank 1,472,820 490,351
Securities sold under repurchase agreements 36,520  
Other borrowings   68,000
Long term debt 175,873 174,006
Derivative liabilities 1,146 2,116
Accrued interest payable 8,074 4,114
Discontinued Operations, Disposed of by Sale | Banc Home Loan    
Financial liabilities    
Loans held-for-sale, carried at fair value 58,954 406,338
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial assets    
Cash and cash equivalents 611,826 439,510
Time deposits in financial institutions 1,000 1,000
Securities available-for-sale 0 0
Securities held-to-maturity   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 34,798 36,382
Derivative assets 0 0
Financial liabilities    
Deposits 0 0
Advances from Federal Home Loan Bank 0 0
Securities sold under repurchase agreements 0  
Other borrowings   0
Long term debt 0 0
Derivative liabilities 0 0
Accrued interest payable 8,074 4,114
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
Time deposits in financial institutions 0 0
Securities available-for-sale 2,755,664 2,381,488
Securities held-to-maturity   899,743
Federal Home Loan Bank and other bank stock 67,063 67,842
Loans held-for-sale 25,392 652,928
Loans and leases receivable, net of ALLL 0 0
Accrued interest receivable 0 0
Derivative assets 1,112 17,968
Financial liabilities    
Deposits 0 0
Advances from Federal Home Loan Bank 1,472,820 490,351
Securities sold under repurchase agreements 36,520  
Other borrowings   68,000
Long term debt 175,873 174,006
Derivative liabilities 1,146 2,116
Accrued interest payable 0 0
Significant Other Observable Inputs (Level 2) | Recurring    
Financial assets    
Loans held-for-sale 17,778 358,714
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 17,800 348,100
Significant Unobservable Inputs (Level 3)    
Financial assets    
Cash and cash equivalents 0 0
Time deposits in financial institutions 0 0
Securities available-for-sale 0 0
Securities held-to-maturity   0
Federal Home Loan Bank and other bank stock 0 0
Loans held-for-sale 84,364 58,260
Loans and leases receivable, net of ALLL 6,195,299 5,999,791
Accrued interest receivable 0 0
Derivative assets 0 0
Financial liabilities    
Deposits 7,198,216 8,908,406
Advances from Federal Home Loan Bank 0 0
Securities sold under repurchase agreements 0  
Other borrowings   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 84,364 58,260
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 41,200 58,300
Carrying Value    
Financial assets    
Cash and cash equivalents 611,826 439,510
Time deposits in financial institutions 1,000 1,000
Securities available-for-sale 2,755,664 2,381,488
Securities held-to-maturity   884,234
Federal Home Loan Bank and other bank stock 67,063 67,842
Loans held-for-sale 109,084 704,651
Loans and leases receivable, net of ALLL 6,181,825 5,994,308
Accrued interest receivable 34,798 36,382
Derivative assets 1,112 17,968
Financial liabilities    
Deposits 7,403,593 9,142,150
Advances from Federal Home Loan Bank 1,470,000 490,000
Securities sold under repurchase agreements 36,520  
Other borrowings   67,922
Long term debt 172,865 175,378
Derivative liabilities 1,146 2,116
Accrued interest payable 8,074 4,114
Carrying Value | Recurring    
Financial assets    
Loans held-for-sale $ 102,142 $ 416,974