Securities - Schedule of Available-for-Sales Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,075,020	$ 2,063,790
Gross Unrealized Gains	146	13,626
Gross Unrealized Losses	183,448	32,903
Fair Value	1,891,718	2,044,513
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	191,051	160,291
Gross Unrealized Gains	0	85
Gross Unrealized Losses	16,949	2,542
Fair Value	174,102	157,834
Obligations of U.S. Government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	863,235	843,218
Gross Unrealized Gains	36	4,527
Gross Unrealized Losses	69,778	15,372
Fair Value	793,493	832,373
Obligations of U.S. states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	95,661	102,177
Gross Unrealized Gains	54	2,092
Gross Unrealized Losses	7,637	100
Fair Value	88,078	104,169
U.S. Government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	63,185	76,502
Gross Unrealized Gains	38	1,187
Gross Unrealized Losses	4,109	532
Fair Value	59,114	77,157
U.S. Government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	859,388	879,102
Gross Unrealized Gains	18	5,735
Gross Unrealized Losses	84,835	14,281
Fair Value	774,571	870,556
U.S. corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,500	2,500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	140	76
Fair Value	$ 2,360	$ 2,424

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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Amount, before tax, of unrealized loss 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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Amortized cost excluding accrued interest, before allowance for credit loss, of 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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-Publisher FASB
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Amount excluding accrued interest, of 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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