Nature of Operations and Summary of Significant Accounting Policies - Fair Value of Securities Correction (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Available for sale
Amortized Cost	$ 1,137,702	$ 1,153,611
Gross Unrealized Gains	335	16,800
Gross Unrealized Losses	(140,479)	(9,599)
Fair Value	997,558	1,160,812
Held to maturity
Investment securities, held to maturity	2,022,748	1,552,443
Gross Unrealized Gains	374	20,954
Gross Unrealized Losses	(341,813)	(13,406)
Fair Value	1,681,309	1,559,991
Federal agency mortgage–backed pools
Available for sale
Amortized Cost	220,963	257,185
Gross Unrealized Gains	0	1,914
Gross Unrealized Losses	(30,307)	(1,408)
Fair Value	190,656	257,691
Held to maturity
Investment securities, held to maturity	343,953	247,937
Gross Unrealized Gains	0	209
Gross Unrealized Losses	(56,714)	(4,010)
Fair Value	287,239	244,136
Private labeled mortgage–backed pools
Available for sale
Amortized Cost		0
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		0
Held to maturity
Investment securities, held to maturity	35,466	40,447
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(5,493)	(442)
Fair Value	$ 29,973	40,005
Total held to maturity investment securities
Available for sale
Amortized Cost		257,185
Gross Unrealized Gains		1,914
Gross Unrealized Losses		(1,408)
Fair Value		257,691
Held to maturity
Investment securities, held to maturity		288,384
Gross Unrealized Gains		209
Gross Unrealized Losses		(4,452)
Fair Value		284,141
As Reported \| Federal agency mortgage–backed pools
Available for sale
Amortized Cost		225,329
Gross Unrealized Gains		1,777
Gross Unrealized Losses		(1,032)
Fair Value		226,074
Held to maturity
Investment securities, held to maturity		188,426
Gross Unrealized Gains		151
Gross Unrealized Losses		(2,612)
Fair Value		185,965
As Reported \| Private labeled mortgage–backed pools
Available for sale
Amortized Cost		31,856
Gross Unrealized Gains		137
Gross Unrealized Losses		(376)
Fair Value		31,617
Held to maturity
Investment securities, held to maturity		99,958
Gross Unrealized Gains		58
Gross Unrealized Losses		(1,840)
Fair Value		98,176
As Reported \| Total held to maturity investment securities
Available for sale
Amortized Cost		257,185
Gross Unrealized Gains		1,914
Gross Unrealized Losses		(1,408)
Fair Value		257,691
Held to maturity
Investment securities, held to maturity		288,384
Gross Unrealized Gains		209
Gross Unrealized Losses		(4,452)
Fair Value		284,141
Adjustment \| Federal agency mortgage–backed pools
Available for sale
Amortized Cost		31,856
Gross Unrealized Gains		137
Gross Unrealized Losses		(376)
Fair Value		31,617
Held to maturity
Investment securities, held to maturity		59,511
Gross Unrealized Gains		58
Gross Unrealized Losses		(1,398)
Fair Value		58,171
Adjustment \| Private labeled mortgage–backed pools
Available for sale
Amortized Cost		(31,856)
Gross Unrealized Gains		(137)
Gross Unrealized Losses		376
Fair Value		(31,617)
Held to maturity
Investment securities, held to maturity		(59,511)
Gross Unrealized Gains		(58)
Gross Unrealized Losses		1,398
Fair Value		$ (58,171)

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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