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Fair Value Information - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available-for-sale | $ 3,068,151 | $ 3,255,211
Financial liabilities, Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | 452,444 | 565,513
Municipal Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available-for-sale | 25,566 | 25,687
Interest Rate Swaps [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 0 | 0
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 0 | 0
Financial liabilities, Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | 71 | 82
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 0 |
Carrying Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available-for-sale | 3,068,151 | 3,255,211
Interest rate swaps, assets | 71 | 82
Financial liabilities, Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | 71 | 82
Carrying Value [Member] | Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 11,129 |
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 | 3,079,351 | 3,255,293
Total liabilities | 71 | 82
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 available-for-sale | 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 available-for-sale | 25,566 | 25,687
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 available-for-sale | 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 available-for-sale | 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 available-for-sale | 2,633,021 | 2,789,141
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 available-for-sale | 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 available-for-sale | 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 available-for-sale | 408,459 | 439,303
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 available-for-sale | 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 available-for-sale | 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 available-for-sale | 1,105 | 1,080
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 available-for-sale | 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 available-for-sale | 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 available-for-sale | 3,068,151 | 3,255,211
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 available-for-sale | 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
Financial liabilities, Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | 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 |  | 82
Financial liabilities, Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | 71 | 82
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
Financial liabilities, Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | 0 | 0
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 0 |
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 71 |
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 0 |
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 0 |
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 11,129 |
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 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 | 3,079,351 | 3,255,293
Total liabilities | 71 | 82
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Not Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 71 |
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 available-for-sale | 25,566 | 25,687
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 available-for-sale | 2,633,021 | 2,789,141
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 available-for-sale | 408,459 | 439,303
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 available-for-sale | 1,105 | 1,080
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 available-for-sale | 3,068,151 | 3,255,211
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 |  | 82
Financial liabilities, Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | 71 | $ 82
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | $ 11,129 |

X
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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