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Shareholders' Equity - Narrative (Detail) $ / shares in Units, $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
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Dec. 15, 2021 | Sep. 15, 2021 USD ($) $ / shares | Aug. 25, 2021 shares | Jun. 15, 2021 | Jun. 15, 2020 | Jan. 31, 2019 $ / shares shares | Dec. 31, 2021 USD ($) series $ / shares | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) series $ / shares shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Nov. 30, 2013
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of outstanding shares authorized for repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00%
Premium percent over current book value |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00%
Repurchase of shares (shares) | shares |  |  |  |  |  | 31,159 |  |  |  |  |  |  |  |
Weighted-average exercise price, outstanding (usd per share) | $ / shares |  |  |  |  |  | $ 18.35 |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased | shares |  |  | 3,235,326 |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased, percent of outstanding shares |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |
Period in force |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (shares) | shares |  |  |  |  |  |  |  |  |  |  | 527,789 |  |  |
Shares repurchased, value |  |  |  |  |  |  |  |  |  |  | $ 27,700 |  |  |
Number of preferred stock series outstanding | series |  |  |  |  |  |  | 2 |  |  |  | 2 |  |  |
Stock redeemed during period, value |  |  |  |  |  |  |  |  |  |  |  |  | $ 571 |
Loss on redemption of preferred stock |  |  |  |  |  |  | $ 0 | $ 2,820 | $ 0 | $ 0 | $ 2,820 | $ 0 | $ 0 |
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 |  |  |  |  |  |  |  |  |  |  |  |
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series C, par value $1.00 per share |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series C, par value $1.00 per share | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable interest rate |  |  |  |  | 5.30% |  |  |  |  |  |  |  |  |
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D, par value $1.00 per share |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 6.50% |  |  |  |  |  |  |  |  |  |
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D, par value $1.00 per share | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable interest rate |  |  |  | 5.09% |  |  |  |  |  |  |  |  |  |
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series E, par value $1.00 per share |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  | $ 25.00 |  |  |

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