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Securities - Available-for-Sale Securities Held by Company (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,831,791	$ 2,063,790
Gross Unrealized Gains	20	13,626
Gross Unrealized Losses	236,844	32,903
Fair Value	1,594,967	2,044,513
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	190,170	160,291
Gross Unrealized Gains	0	85
Gross Unrealized Losses	22,919	2,542
Fair Value	167,251	157,834
Obligations of U.S. Government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	681,192	843,218
Gross Unrealized Gains	0	4,527
Gross Unrealized Losses	80,025	15,372
Fair Value	601,167	832,373
Obligations of U.S. states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	93,599	102,177
Gross Unrealized Gains	8	2,092
Gross Unrealized Losses	8,326	100
Fair Value	85,281	104,169
U.S. Government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	58,727	76,502
Gross Unrealized Gains	12	1,187
Gross Unrealized Losses	6,071	532
Fair Value	52,668	77,157
U.S. Government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	805,603	879,102
Gross Unrealized Gains	0	5,735
Gross Unrealized Losses	119,381	14,281
Fair Value	686,222	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	122	76
Fair Value	$ 2,378	$ 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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