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Fair Value Information - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | $ 30,181 | $ 11,502
Interest rate swaps, liabilities | 469,587 | 440,161
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 | 30,181 | 11,502
Interest rate swaps, liabilities | 30,181 | 11,502
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 | 2,429,104 | 1,751,759
Total liabilities | 30,181 | 11,502
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 | 30,285 | 39,354
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 | 1,904,935 | 1,206,313
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 | 462,814 | 493,710
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 | 889 | 880
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 | 2,398,923 | 1,740,257
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 | 30,181 | 11,502
Interest rate swaps, liabilities | 30,181 | 11,502
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 | 2,429,104 | 1,751,759
Total liabilities | 30,181 | 11,502
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 | 30,285 | 39,354
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 | 1,904,935 | 1,206,313
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 | 462,814 | 493,710
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 | 889 | 880
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 | 2,398,923 | 1,740,257
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 | 30,181 | 11,502
Interest rate swaps, liabilities | $ 30,181 | $ 11,502

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