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Fair Value Information - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets $ 11,502 $ 1,938
Interest rate swaps, liabilities 440,161 444,193
Interest Rate Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0 0
Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 11,502 1,938
Interest rate swaps, liabilities 11,502 1,938
Fair Value on Recurring Basis [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 0 0
Total liabilities 0 0
Fair Value on Recurring Basis [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 1,751,759 1,736,023
Total liabilities 11,502 1,938
Fair Value on Recurring Basis [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 0 0
Total liabilities 0 0
Fair Value on Recurring Basis [Member] | Municipal Bonds [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 0 0
Fair Value on Recurring Basis [Member] | Municipal Bonds [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 39,354 44,810
Fair Value on Recurring Basis [Member] | Municipal Bonds [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 0 0
Fair Value on Recurring Basis [Member] | Mortgage-backed Securities [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 0 0
Fair Value on Recurring Basis [Member] | Mortgage-backed Securities [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 1,206,313 1,474,508
Fair Value on Recurring Basis [Member] | Mortgage-backed Securities [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 0 0
Fair Value on Recurring Basis [Member] | CMO/REMIC [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 0 0
Fair Value on Recurring Basis [Member] | CMO/REMIC [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 493,710 214,051
Fair Value on Recurring Basis [Member] | CMO/REMIC [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 0 0
Fair Value on Recurring Basis [Member] | Other Securities [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 0 0
Fair Value on Recurring Basis [Member] | Other Securities [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 880 716
Fair Value on Recurring Basis [Member] | Other Securities [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 0 0
Fair Value on Recurring Basis [Member] | Investment Securities-AFS [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 0 0
Fair Value on Recurring Basis [Member] | Investment Securities-AFS [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 1,740,257 1,734,085
Fair Value on Recurring Basis [Member] | Investment Securities-AFS [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 0 0
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0 0
Interest rate swaps, liabilities 0 0
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 11,502 1,938
Interest rate swaps, liabilities 11,502 1,938
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 0 0
Interest rate swaps, liabilities 0 0
Fair Value on Recurring Basis [Member] | Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 1,751,759 1,736,023
Total liabilities 11,502 1,938
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Municipal Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 39,354 44,810
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Mortgage-backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 1,206,313 1,474,508
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | CMO/REMIC [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 493,710 214,051
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Other Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 880 716
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Investment Securities-AFS [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities - AFS 1,740,257 1,734,085
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Interest Rate Swaps [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps, assets 11,502 1,938
Interest rate swaps, liabilities $ 11,502 $ 1,938