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Fair Value Information - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, liabilities | $ 400,421 | $ 556,984
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 | 944 | 3,211
Interest rate swaps, liabilities | 944 | 3,211
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 | 1,807,175 | 2,084,196
Total liabilities | 944 | 3,211
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 | 48,739 | 55,496
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] | Residential 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] | Residential Mortgage-backed Securities [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities - AFS | 1,532,878 | 1,750,909
Fair Value on Recurring Basis [Member] | Residential 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 - Residential [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 - Residential [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities - AFS | 223,817 | 273,829
Fair Value on Recurring Basis [Member] | CMO/REMIC - Residential [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 | 797 | 751
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 | 1,806,231 | 2,080,985
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 | 944 | 3,211
Interest rate swaps, liabilities | 944 | 3,211
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 | 1,807,175 | 2,084,196
Total liabilities | 944 | 3,211
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 | 48,739 | 55,496
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Residential Mortgage-backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities - AFS | 1,532,878 | 1,750,909
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | CMO/REMIC - Residential [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities - AFS | 223,817 | 273,829
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 | 797 | 751
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 | 1,806,231 | 2,080,985
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 | 944 | 3,211
Interest rate swaps, liabilities | $ 944 | $ 3,211

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