Securities - Estimated Fair Value and Unrealized Loss for Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands	Jun. 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	$ 479,290	$ 444,596
Available-for-sale, Less than 12 months, Unrealized Losses	(35,132)	(2,894)
Available-for-sale, 12 months or Longer, Estimated Fair Value	27,985	0
Available-for-sale, 12 months or longer, Unrealized Losses	(1,354)	0
Available-for-sale, Total, Estimated Fair Value	507,275	444,596
Available-for-sale, Total, Unrealized Losses	(36,486)	(2,894)
Held-to-maturity, Less than 12 months, Estimated Fair Value	692,515	572,009
Held-to-maturity, Less than 12 months, Unrealized Losses	(60,263)	(8,309)
Held-to-maturity, 12 months or longer, Estimated Fair Value	210,800	55,402
Held-to-maturity, 12 months or longer, Unrealized Losses	(25,034)	(1,462)
Held-to-maturity, Total, Estimated Fair Value	903,315	627,411
Held-to-maturity, total, unrealized losses	(85,297)	(9,771)
Total securities, Less than 12 months, Estimated Fair Value	1,171,805	1,016,605
Total securities, Less than 12 months, Unrealized Losses	(95,395)	(11,203)
Total securities, 12 months or longer, Estimated Fair Value	238,785	55,402
Total securities, 12 months or longer, Unrealized Losses	(26,388)	(1,462)
Total securities, Estimated Fair Value	1,410,590	1,072,007
Total securities, Unrealized Losses	(121,783)	(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	120,061	82,395
Available-for-sale, Less than 12 months, Unrealized Losses	(5,543)	(471)
Available-for-sale, 12 months or Longer, Estimated Fair Value	5,742	0
Available-for-sale, 12 months or longer, Unrealized Losses	(48)	0
Available-for-sale, Total, Estimated Fair Value	125,803	82,395
Available-for-sale, Total, Unrealized Losses	(5,591)	(471)
Corporate debt securities
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Held-to-maturity, total, unrealized losses	(3,247)	(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	4,590	1,989
Available-for-sale, Less than 12 months, Unrealized Losses	(410)	(11)
Available-for-sale, 12 months or Longer, Estimated Fair Value	0	0
Available-for-sale, 12 months or longer, Unrealized Losses	0	0
Available-for-sale, Total, Estimated Fair Value	4,590	1,989
Available-for-sale, Total, Unrealized Losses	(410)	(11)
Held-to-maturity, Less than 12 months, Estimated Fair Value	6,904	38,304
Held-to-maturity, Less than 12 months, Unrealized Losses	(224)	(1,279)
Held-to-maturity, 12 months or longer, Estimated Fair Value	35,308	0
Held-to-maturity, 12 months or longer, Unrealized Losses	(3,023)	0
Held-to-maturity, Total, Estimated Fair Value	42,212	38,304
Held-to-maturity, total, unrealized losses	(3,247)	(1,279)
Asset-backed securities
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Available-for-sale, Less than 12 months, Unrealized Losses	(15,945)
Available-for-sale, 12 months or Longer, Estimated Fair Value	22,243
Available-for-sale, 12 months or longer, Unrealized Losses	(1,306)
Available-for-sale, Total, Estimated Fair Value	278,981
Available-for-sale, Total, Unrealized Losses	(17,251)
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	256,738	279,486
Available-for-sale, Less than 12 months, Unrealized Losses		(1,489)
Available-for-sale, 12 months or Longer, Estimated Fair Value		0
Available-for-sale, 12 months or longer, Unrealized Losses		0
Available-for-sale, Total, Estimated Fair Value		279,486
Available-for-sale, Total, Unrealized Losses		(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	484,025	458,376
Held-to-maturity, Less than 12 months, Unrealized Losses	(40,205)	(5,967)
Held-to-maturity, 12 months or longer, Estimated Fair Value	160,408	51,019
Held-to-maturity, 12 months or longer, Unrealized Losses	(20,402)	(1,361)
Held-to-maturity, Total, Estimated Fair Value	644,433	509,395
Held-to-maturity, total, unrealized losses	(60,607)	(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	97,901	80,726
Available-for-sale, Less than 12 months, Unrealized Losses	(13,234)	(923)
Available-for-sale, 12 months or Longer, Estimated Fair Value	0	0
Available-for-sale, 12 months or longer, Unrealized Losses	0	0
Available-for-sale, Total, Estimated Fair Value	97,901	80,726
Available-for-sale, Total, Unrealized Losses	(13,234)	(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	453,637	445,399
Held-to-maturity, Less than 12 months, Unrealized Losses	(38,586)	(5,822)
Held-to-maturity, 12 months or longer, Estimated Fair Value	158,125	50,133
Held-to-maturity, 12 months or longer, Unrealized Losses	(20,367)	(1,358)
Held-to-maturity, Total, Estimated Fair Value	611,762	495,532
Held-to-maturity, total, unrealized losses	(58,953)	(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		2,255
Held-to-maturity, Less than 12 months, Unrealized Losses		(41)
Held-to-maturity, 12 months or longer, Estimated Fair Value	2,283	886
Held-to-maturity, 12 months or longer, Unrealized Losses	(35)	(3)
Held-to-maturity, Total, Estimated Fair Value	2,283	3,141
Held-to-maturity, total, unrealized losses	(35)	(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	30,388	10,722
Held-to-maturity, Less than 12 months, Unrealized Losses	(1,619)	(104)
Held-to-maturity, 12 months or longer, Estimated Fair Value	0	0
Held-to-maturity, 12 months or longer, Unrealized Losses	0	0
Held-to-maturity, Total, Estimated Fair Value	30,388	10,722
Held-to-maturity, total, unrealized losses	(1,619)	(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	(21,443)	(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	201,586	75,329
Held-to-maturity, Less than 12 months, Unrealized Losses	(19,834)	(1,063)
Held-to-maturity, 12 months or longer, Estimated Fair Value	15,084	4,383
Held-to-maturity, 12 months or longer, Unrealized Losses	(1,609)	(101)
Held-to-maturity, Total, Estimated Fair Value	216,670	79,712
Held-to-maturity, total, unrealized losses	$ (21,443)	$ (1,164)