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Securities - Summary of Amortized Cost and Fair Values of Securities Available-for-sale (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	$ 1,465,151	$ 1,466,482
Available-for-sale Securities, Gross Unrealized Gains	1,388	10,492
Available-for-sale Securities, Gross Unrealized Losses	(97,171)	(22,432)
Available-for-sale Securities, Fair Value	1,369,368	1,454,542
U.S. Treasury Notes
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	24,875	18,447
Available-for-sale Securities, Gross Unrealized Gains	4	37
Available-for-sale Securities, Gross Unrealized Losses	(654)	(8)
Available-for-sale Securities, Fair Value	24,225	18,476
U.S. Government Agencies
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	149,164	141,096
Available-for-sale Securities, Gross Unrealized Gains	328	661
Available-for-sale Securities, Gross Unrealized Losses	(9,252)	(2,367)
Available-for-sale Securities, Fair Value	140,240	139,390
Obligations of States, Municipalities, and Political Subdivisions
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	83,786	86,454
Available-for-sale Securities, Gross Unrealized Gains	512	3,238
Available-for-sale Securities, Gross Unrealized Losses	(2,170)	(56)
Available-for-sale Securities, Fair Value	82,128	89,636
Agency, Residential Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	758,179	756,549
Available-for-sale Securities, Gross Unrealized Gains	21	2,122
Available-for-sale Securities, Gross Unrealized Losses	(57,343)	(15,015)
Available-for-sale Securities, Fair Value	700,857	743,656
Non-Agency, Residential Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	140,350	146,499
Available-for-sale Securities, Gross Unrealized Gains	0	4
Available-for-sale Securities, Gross Unrealized Losses	(9,926)	(1,267)
Available-for-sale Securities, Fair Value	130,424	145,236
Agency, Commercial Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	206,203	214,417
Available-for-sale Securities, Gross Unrealized Gains	25	2,795
Available-for-sale Securities, Gross Unrealized Losses	(16,535)	(3,661)
Available-for-sale Securities, Fair Value	189,693	213,551
Corporate Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	65,798	65,814
Available-for-sale Securities, Gross Unrealized Gains	488	1,586
Available-for-sale Securities, Gross Unrealized Losses	(1,144)	(54)
Available-for-sale Securities, Fair Value	65,142	67,346
Asset-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	36,796	37,206
Available-for-sale Securities, Gross Unrealized Gains	10	49
Available-for-sale Securities, Gross Unrealized Losses	(147)	(4)
Available-for-sale Securities, Fair Value	$ 36,659	$ 37,251

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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