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Significant Accounting Policies and Basis of Presentation - Narrative (Detail) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) | Jan. 01, 2020 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) Swap position contract | Dec. 31, 2021 USD ($) Swap contract position | Dec. 31, 2020 USD ($) | Dec. 31, 2014 | Dec. 31, 2019 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |
Average reserve balances required to be maintained with federal reserve bank |  |  |  | $ 0 | $ 0 |  |  |
Proceeds from sales of investment securities available for sale |  |  |  | 983,575 | 689,856 | $ 387,810 |  |
Transfer of investment securities available for sale to held to maturity |  |  | $ 500,200 | $ 500,174 | 0 | 0 |  |
Unrealized losses recorded in AOCI upon transfer to held to maturity |  |  | $ 50,000 |  |  |  |  |
Carrying value of consumer loans sold | $ 521,800 |  |  |  |  |  |  |
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 |  |  |  | $ 3,629 | 3,736 |  |  |
FHLB, Federal Reserve Bank, and other restricted stock |  |  |  | 74,196 | 64,584 |  |  |
Federal Home Loan Bank stock |  |  |  | $ 38,000 | 35,800 |  |  |
Percentage of tax position that will be realized or sustained upon examination |  |  |  | 50.00% |  |  |  |
Shareholders' equity |  |  |  | $ 1,402,961 | 1,366,217 | 1,117,086 |  | $ 1,052,795
Cumulative effect of change in accounting principle |  | $ 144,200 |  | 130,924 | 137,804 | 144,176 |  | 56,379
Allowance for credit losses on lending-related commitments |  |  |  | $ 3,000 | $ 2,100 |  |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Asset-backed securities collateralized by loans sold | $ 400,000 |  |  |  |  |  |  |
Interest-only GNMA securities |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Proceeds from sales of investment 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 |  |  |  | 141 | 153 |  |  |
Derivative notional amount |  |  |  | $ 1,300,000 | $ 1,400,000 |  |  |
Interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of interest rate swaps | contract |  |  |  | 0 | 0 |  |  |
Derivative notional amount |  |  |  |  | $ 850,000 |  |  |
Interest rate swaps | Fair Value Hedging | Designated as Hedging Instrument |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of interest rate swaps | position |  |  |  | 3 | 16 |  |  |
Derivative notional amount |  |  |  | $ 22,500 | $ 80,500 |  |  |
Credit contracts | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  | $ 142,000 | 129,900 |  |  |
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 |  |  |  | $ 924,134 | $ 705,732 | $ 438,581 |  | 381,519
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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