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Securities - Schedule of Fair Value of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available for sale
Amortized Cost	$ 634,615	$ 1,137,702
Gross Unrealized Gains	455	335
Gross Unrealized Losses	(87,819)	(140,479)
Fair Value	547,251	997,558
Held to maturity
Investment securities, held to maturity	1,945,795	2,022,748
Gross Unrealized Gains	1,185	374
Gross Unrealized Losses	(278,222)	(341,813)
Fair Value	1,668,758	1,681,309
Allowance for Credit Losses	(157)
Net Carrying Amount	1,945,638	2,022,748
U.S. Treasury and federal agencies
Available for sale
Amortized Cost	72,938	294,329
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(8,561)	(27,150)
Fair Value	64,377	267,179
Held to maturity
Investment securities, held to maturity	287,259	295,250
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(41,299)	(49,237)
Fair Value	245,960	246,013
Allowance for Credit Losses	0
Net Carrying Amount	287,259
State and municipal
Available for sale
Amortized Cost	353,299	505,006
Gross Unrealized Gains	0	140
Gross Unrealized Losses	(49,269)	(71,602)
Fair Value	304,030	433,544
Held to maturity
Investment securities, held to maturity	1,088,499	1,127,669
Gross Unrealized Gains	1,185	374
Gross Unrealized Losses	(150,323)	(192,458)
Fair Value	939,361	935,585
Allowance for Credit Losses	(20)
Net Carrying Amount	1,088,479
Federal agency collateralized mortgage obligations
Available for sale
Amortized Cost	3,931	33,011
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(351)	(1,796)
Fair Value	3,580	31,215
Held to maturity
Investment securities, held to maturity	51,325	56,564
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(7,846)	(8,865)
Fair Value	43,479	47,699
Allowance for Credit Losses	0
Net Carrying Amount	51,325
Federal agency mortgage–backed pools
Available for sale
Amortized Cost	161,130	220,963
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(23,833)	(30,307)
Fair Value	137,297	190,656
Held to maturity
Investment securities, held to maturity	323,649	343,953
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(48,621)	(56,714)
Fair Value	275,028	287,239
Allowance for Credit Losses	0
Net Carrying Amount	323,649
Private labeled mortgage–backed pools
Held to maturity
Investment securities, held to maturity	32,329	35,466
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(4,595)	(5,493)
Fair Value	27,734	29,973
Allowance for Credit Losses	(7)
Net Carrying Amount	32,322
Corporate notes
Available for sale
Amortized Cost	43,317	84,393
Gross Unrealized Gains	455	195
Gross Unrealized Losses	(5,805)	(9,624)
Fair Value	37,967	74,964
Held to maturity
Investment securities, held to maturity	162,734	163,846
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(25,538)	(29,046)
Fair Value	137,196	$ 134,800
Allowance for Credit Losses	(130)
Net Carrying Amount	$ 162,604

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