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Shareholders' Equity - Narrative (Detail) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 15, 2021 | Sep. 15, 2021 USD ($) $ / shares | Jun. 15, 2021 | Dec. 31, 2021 USD ($) shares | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) series $ / shares shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Aug. 25, 2021 shares
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased |  |  |  |  |  |  |  |  |  |  | 3,235,326
Number of shares authorized to be repurchased, percent of outstanding shares |  |  |  |  |  |  |  |  |  |  | 10.00%
Shares repurchased (shares) |  |  |  |  |  |  |  | 830,145 | 527,789 |  |
Shares repurchased, value | $ |  |  |  |  |  |  |  | $ 33,162 | $ 27,662 |  |
Number of preferred stock series outstanding | series |  |  |  |  |  |  |  | 2 |  |  |
Stock redeemed during period, value | $ |  |  |  |  |  |  |  |  | 79,677 |  |
Loss on redemption of preferred stock | $ |  |  |  | $ 0 | $ 2,820 | $ 0 | $ 0 | $ 0 | $ 2,820 | $ 0 |
Preferred stock, shares outstanding (in shares) |  |  |  | 5,700,000 |  |  |  | 5,700,000 | 5,700,000 |  |
Preferred stock, shares issued |  |  |  | 5,700,000 |  |  |  | 5,700,000 | 5,700,000 |  |
Series C and D Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock redeemed during period, value | $ |  | $ 82,500 |  |  |  |  |  |  |  |  |
Preferred stock, redemption price (usd per share) | $ / shares |  | $ 25.00 |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  | 0 |  |  |  | 0 | 0 |  |
Preferred stock, shares issued |  |  |  | 0 |  |  |  | 0 | 0 | 0 |
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series E, par value $1.00 per share |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  |  | 2,300,000 |  |  |  | 2,300,000 | 2,300,000 |  |
Interest rate, stated percentage |  |  | 6.45% |  |  |  |  |  |  |  |
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series E, par value $1.00 per share | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |
Spread on variable interest rate |  |  | 5.14% |  |  |  |  |  |  |  |
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series F, par value $1.00 per share |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  |  | 3,400,000 |  |  |  | 3,400,000 | 3,400,000 |  |
Interest rate, stated percentage | 6.00% |  |  |  |  |  |  |  |  |  |
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series F, par value $1.00 per share | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |
Spread on variable interest rate | 4.762% |  |  |  |  |  |  |  |  |  |
Series E and F Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, redemption price (usd per share) | $ / shares |  |  |  |  |  |  |  | $ 25.00 |  |  |

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