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Significant Accounting Policies and Basis of Presentation - Narrative (Detail) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2020 USD ($) | Dec. 31, 2021 USD ($) Swap position contract | Dec. 31, 2020 USD ($) contract Swap position | Dec. 31, 2019 USD ($) | Dec. 31, 2014 | Nov. 30, 2020 USD ($) position | Dec. 31, 2018 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |
Average reserve balances required to be maintained with federal reserve bank |  | $ 0 | $ 0 |  |  |  |
Available-for-sale debt securities, accrued interest |  | 11,000 | 4,200 |  |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale |  | 689,856 | 387,810 | $ 97,555 |  |  |
Shareholders' equity |  | $ 1,366,217 | 1,117,086 | 1,052,795 |  |  | $ 956,816
Contractual payment of principal duration (days) |  | 90 days |  |  |  |  |
Contractual terms for loans (months) |  | 6 months |  |  |  |  |
Maximum loan to value ratio |  | 80.00% |  |  |  |  |
Threshold period past due, writeoff |  | 120 days |  |  |  |  |
Goodwill and other intangibles |  | $ 3,736 | 3,969 |  |  |  |
FHLB, Federal Reserve Bank, and other restricted stock |  | 64,584 | 71,368 |  |  |  |
Federal Home Loan Bank stock |  | $ 35,800 | 46,100 |  |  |  |
Percentage of tax position that will be realized or sustained upon examination |  | 50.00% |  |  |  |  |
Cumulative effect of change in accounting principle | $ 136,200 | $ 137,804 | 144,176 | 56,379 |  |  |
Allowance for credit losses on lending-related commitments |  | $ 2,100 | 2,300 |  |  |  |
Interest-only GNMA securities |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale |  |  | 15,400 |  |  |  |
Debt securities, realized gain |  |  | $ 1,000 |  |  |  |
Accounting Standards Update 2016-13 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Initial allowance on loans purchased with credit deterioration | 200 |  |  |  |  |  |
Financing receivable, purchased with credit deterioration, discount | 300 |  |  |  |  |  |
Interest rate swaps | Not Designated as Hedging Instrument |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of interest rate swaps | Swap |  | 153 | 155 |  |  |  |
Derivative notional amount |  | $ 1,400,000 | $ 1,400,000 |  |  |  |
Interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of interest rate swaps | contract |  | 0 | 5 |  |  |  |
Derivative notional amount |  | $ 850,000 | $ 1,100,000 |  |  |  |
Interest rate swaps | Fair Value Hedging | Designated as Hedging Instrument |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of interest rate swaps | position |  | 16 | 24 |  |  | 24 |
Derivative notional amount |  | $ 80,500 | $ 272,300 |  |  | $ 272,300 |
Credit contracts | Not Designated as Hedging Instrument |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative notional amount |  | $ 129,900 | 177,200 |  |  |  |
ESPP |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Purchase price under employee stock purchase plan (percent) |  | 85.00% |  |  | 85.00% |  |
Purchase price under employee stock purchase plan, discount (percent) |  | 15.00% |  |  | 15.00% |  |
Retained Earnings |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Shareholders' equity |  | $ 705,732 | $ 438,581 | 381,519 |  |  | $ 316,651
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Shareholders' equity |  |  |  | (61,475) |  |  |
Net deferred tax (asset) liability | (21,500) |  |  |  |  |  |
Cumulative effect of change in accounting principle | 79,800 |  |  | 79,829 |  |  |
Allowance for credit losses on lending-related commitments | 3,400 |  |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Shareholders' equity | $ (61,500) |  |  | $ (61,475) |  |  |

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