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Securities - Schedule of Fair Value of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Available for sale
Amortized Cost	$ 628,431	$ 634,615
Gross Unrealized Gains	0	455
Gross Unrealized Losses	(93,112)	(87,819)
Fair Value	535,319	547,251
Held to maturity
Amortized Cost	1,925,883	1,945,795
Gross Unrealized Gains	543	1,185
Gross Unrealized Losses	(298,573)	(278,222)
Fair Value	1,627,853	1,668,758
Allowance for Credit Losses	(158)	(157)
Net Carrying Amount	1,925,725	1,945,638
U.S. Treasury and federal agencies
Available for sale
Amortized Cost	71,943	72,938
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(9,017)	(8,561)
Fair Value	62,926	64,377
Held to maturity
Amortized Cost	284,236	287,259
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(43,199)	(41,299)
Fair Value	241,037	245,960
Allowance for Credit Losses	0	0
Net Carrying Amount	284,236	287,259
State and municipal
Available for sale
Amortized Cost	352,738	353,299
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(53,483)	(49,269)
Fair Value	299,255	304,030
Held to maturity
Amortized Cost	1,078,388	1,088,499
Gross Unrealized Gains	543	1,185
Gross Unrealized Losses	(167,301)	(150,323)
Fair Value	911,630	939,361
Allowance for Credit Losses	(21)	(20)
Net Carrying Amount	1,078,367	1,088,479
Federal agency collateralized mortgage obligations
Available for sale
Amortized Cost	3,819	3,931
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(369)	(351)
Fair Value	3,450	3,580
Held to maturity
Amortized Cost	49,913	51,325
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(8,088)	(7,846)
Fair Value	41,825	43,479
Allowance for Credit Losses	0	0
Net Carrying Amount	49,913	51,325
Federal agency mortgage-backed pools
Available for sale
Amortized Cost	157,812	161,130
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(24,670)	(23,833)
Fair Value	133,142	137,297
Held to maturity
Amortized Cost	319,181	323,649
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(50,329)	(48,621)
Fair Value	268,852	275,028
Allowance for Credit Losses	0	0
Net Carrying Amount	319,181	323,649
Private labeled mortgage-backed pools
Held to maturity
Amortized Cost	31,712	32,329
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(4,530)	(4,595)
Fair Value	27,182	27,734
Allowance for Credit Losses	(7)	(7)
Net Carrying Amount	31,705	32,322
Corporate notes
Available for sale
Amortized Cost	42,119	43,317
Gross Unrealized Gains	0	455
Gross Unrealized Losses	(5,573)	(5,805)
Fair Value	36,546	37,967
Held to maturity
Amortized Cost	162,453	162,734
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(25,126)	(25,538)
Fair Value	137,327	137,196
Allowance for Credit Losses	(130)	(130)
Net Carrying Amount	$ 162,323	$ 162,604

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