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Shareholders' Equity - Narrative (Detail) $ / shares in Units, $ in Thousands						1 Months Ended	3 Months Ended				12 Months Ended
	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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