Securities - Estimated Fair Value and Unrealized Loss for Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Available-for-sale, Less than 12 months, Estimated Fair Value	$ 373,764	$ 444,596
Available-for-sale, Less than 12 months, Unrealized Losses	(39,311)	(2,894)
Available-for-sale, 12 months or Longer, Estimated Fair Value	96,537	0
Available-for-sale, 12 months or longer, Unrealized Losses	(9,686)	0
Available-for-sale, Total, Estimated Fair Value	470,301	444,596
Available-for-sale, Total, Unrealized Losses	(48,997)	(2,894)
Held-to-maturity, Less than 12 months, Estimated Fair Value	463,077	572,009
Held-to-maturity, Less than 12 months, Unrealized Losses	(51,935)	(8,309)
Held-to-maturity, 12 months or longer, Estimated Fair Value	420,336	55,402
Held-to-maturity, 12 months or longer, Unrealized Losses	(74,534)	(1,462)
Held-to-maturity, Total, Estimated Fair Value	883,413	627,411
Held-to-maturity, total, unrealized losses	(126,469)	(9,771)
Total securities, Less than 12 months, Estimated Fair Value	836,841	1,016,605
Total securities, Less than 12 months, Unrealized Losses	(91,246)	(11,203)
Total securities, 12 months or longer, Estimated Fair Value	516,873	55,402
Total securities, 12 months or longer, Unrealized Losses	(84,220)	(1,462)
Total securities, Estimated Fair Value	1,353,714	1,072,007
Total securities, Unrealized Losses	(175,466)	(12,665)
U.S. government and agency obligations | Investment securities
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Available-for-sale, Less than 12 months, Estimated Fair Value	75,464	82,395
Available-for-sale, Less than 12 months, Unrealized Losses	(5,924)	(471)
Available-for-sale, 12 months or Longer, Estimated Fair Value	23,635	0
Available-for-sale, 12 months or longer, Unrealized Losses	(2,175)	0
Available-for-sale, Total, Estimated Fair Value	99,099	82,395
Available-for-sale, Total, Unrealized Losses	(8,099)	(471)
Corporate debt securities
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Held-to-maturity, total, unrealized losses	(3,135)	(1,279)
Corporate debt securities | Investment securities
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Available-for-sale, Less than 12 months, Estimated Fair Value	3,496	1,989
Available-for-sale, Less than 12 months, Unrealized Losses	(504)	(11)
Available-for-sale, 12 months or Longer, Estimated Fair Value	877	0
Available-for-sale, 12 months or longer, Unrealized Losses	(124)	0
Available-for-sale, Total, Estimated Fair Value	4,373	1,989
Available-for-sale, Total, Unrealized Losses	(628)	(11)
Held-to-maturity, Less than 12 months, Estimated Fair Value	14,142	38,304
Held-to-maturity, Less than 12 months, Unrealized Losses	(319)	(1,279)
Held-to-maturity, 12 months or longer, Estimated Fair Value	36,516	0
Held-to-maturity, 12 months or longer, Unrealized Losses	(2,816)	0
Held-to-maturity, Total, Estimated Fair Value	50,658	38,304
Held-to-maturity, total, unrealized losses	(3,135)	(1,279)
Asset-backed securities | Investment securities
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Available-for-sale, Less than 12 months, Estimated Fair Value	216,926	279,486
Available-for-sale, Less than 12 months, Unrealized Losses	(16,650)	(1,489)
Available-for-sale, 12 months or Longer, Estimated Fair Value	57,947	0
Available-for-sale, 12 months or longer, Unrealized Losses	(4,705)	0
Available-for-sale, Total, Estimated Fair Value	274,873	279,486
Available-for-sale, Total, Unrealized Losses	(21,355)	(1,489)
Mortgage-backed securities:
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Held-to-maturity, Less than 12 months, Estimated Fair Value	276,845	458,376
Held-to-maturity, Less than 12 months, Unrealized Losses	(29,156)	(5,967)
Held-to-maturity, 12 months or longer, Estimated Fair Value	325,171	51,019
Held-to-maturity, 12 months or longer, Unrealized Losses	(63,126)	(1,361)
Held-to-maturity, Total, Estimated Fair Value	602,016	509,395
Held-to-maturity, total, unrealized losses	(92,282)	(7,328)
Mortgage-backed securities: | Investment securities
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Available-for-sale, Less than 12 months, Estimated Fair Value	77,878	80,726
Available-for-sale, Less than 12 months, Unrealized Losses	(16,233)	(923)
Available-for-sale, 12 months or Longer, Estimated Fair Value	14,078	0
Available-for-sale, 12 months or longer, Unrealized Losses	(2,682)	0
Available-for-sale, Total, Estimated Fair Value	91,956	80,726
Available-for-sale, Total, Unrealized Losses	(18,915)	(923)
Mortgage-backed securities: | Agency residential
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Held-to-maturity, Less than 12 months, Estimated Fair Value	252,724	445,399
Held-to-maturity, Less than 12 months, Unrealized Losses	(26,933)	(5,822)
Held-to-maturity, 12 months or longer, Estimated Fair Value	318,925	50,133
Held-to-maturity, 12 months or longer, Unrealized Losses	(62,763)	(1,358)
Held-to-maturity, Total, Estimated Fair Value	571,649	495,532
Held-to-maturity, total, unrealized losses	(89,696)	(7,180)
Mortgage-backed securities: | Agency commercial
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Held-to-maturity, Less than 12 months, Estimated Fair Value	3,609	2,255
Held-to-maturity, Less than 12 months, Unrealized Losses	(242)	(41)
Held-to-maturity, 12 months or longer, Estimated Fair Value	2,092	886
Held-to-maturity, 12 months or longer, Unrealized Losses	(37)	(3)
Held-to-maturity, Total, Estimated Fair Value	5,701	3,141
Held-to-maturity, total, unrealized losses	(279)	(44)
Mortgage-backed securities: | Non-agency commercial
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Held-to-maturity, Less than 12 months, Estimated Fair Value	20,512	10,722
Held-to-maturity, Less than 12 months, Unrealized Losses	(1,981)	(104)
Held-to-maturity, 12 months or longer, Estimated Fair Value	4,154	0
Held-to-maturity, 12 months or longer, Unrealized Losses	(326)	0
Held-to-maturity, Total, Estimated Fair Value	24,666	10,722
Held-to-maturity, total, unrealized losses	(2,307)	(104)
State, municipal and sovereign debt obligations
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Held-to-maturity, total, unrealized losses	(31,052)	(1,164)
State, municipal and sovereign debt obligations | Investment securities
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Held-to-maturity, Less than 12 months, Estimated Fair Value	172,090	75,329
Held-to-maturity, Less than 12 months, Unrealized Losses	(22,460)	(1,063)
Held-to-maturity, 12 months or longer, Estimated Fair Value	58,649	4,383
Held-to-maturity, 12 months or longer, Unrealized Losses	(8,592)	(101)
Held-to-maturity, Total, Estimated Fair Value	230,739	79,712
Held-to-maturity, total, unrealized losses	$ (31,052)	$ (1,164)