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Securities - Available-for-Sale Securities Held by Company (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,106,906	$ 2,063,790
Gross Unrealized Gains	1,290	13,626
Gross Unrealized Losses	127,048	32,903
Fair Value	1,981,148	2,044,513
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	190,997	160,291
Gross Unrealized Gains	0	85
Gross Unrealized Losses	12,094	2,542
Fair Value	178,903	157,834
Obligations of U.S. Government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	852,733	843,218
Gross Unrealized Gains	898	4,527
Gross Unrealized Losses	51,524	15,372
Fair Value	802,107	832,373
Obligations of U.S. states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	100,287	102,177
Gross Unrealized Gains	152	2,092
Gross Unrealized Losses	4,778	100
Fair Value	95,661	104,169
U.S. Government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	68,435	76,502
Gross Unrealized Gains	157	1,187
Gross Unrealized Losses	2,315	532
Fair Value	66,277	77,157
U.S. Government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	891,954	879,102
Gross Unrealized Gains	83	5,735
Gross Unrealized Losses	56,264	14,281
Fair Value	835,773	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	73	76
Fair Value	$ 2,427	$ 2,424

X

- Definition

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).

+ References

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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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