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Investment Securities - Summary of Held-to-maturity Securities by Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	$ 8,000
Debt securities, maturing 1 to 5 years, amortized cost	32,196
Debt securities, maturing 5 to 10 years, amortized cost	98,358
Debt securities, maturing over 10 years, amortized cost	555,319
Amortized Cost	693,873	$ 683,895
Debt securities, maturing within 1 year, fair value	7,989
Debt securities, maturing 1 to 5 years, fair value	30,862
Debt securities, maturing 5 to 10 years, fair value	92,020
Debt securities, maturing over 10 years, fair value	505,658
Debt securities, held-to-maturity, fair value	$ 636,529	612,022
Held-to-maturity securities, maturing within 1 year, weighted average yield	3.98%
Held-to-maturity securities, maturing 1 to 5 years, weighted average yield	2.94%
Held-to-maturity securities, maturing 6 to 10 years, weighted average yield	3.74%
Held-to-maturity securities, maturing over 10 years, weighted average yield	3.72%
Held-to-maturity securities, total weighted average yield	3.69%
U.S. government sponsored agencies
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	$ 8,000
Debt securities, maturing 1 to 5 years, amortized cost	10,625
Debt securities, maturing 5 to 10 years, amortized cost	44,182
Debt securities, maturing over 10 years, amortized cost	133,835
Amortized Cost	196,642	188,475
Debt securities, maturing within 1 year, fair value	7,989
Debt securities, maturing 1 to 5 years, fair value	10,347
Debt securities, maturing 5 to 10 years, fair value	44,226
Debt securities, maturing over 10 years, fair value	129,048
Debt securities, held-to-maturity, fair value	191,610	180,825
States and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	0
Debt securities, maturing 1 to 5 years, amortized cost	8,323
Debt securities, maturing 5 to 10 years, amortized cost	15,960
Debt securities, maturing over 10 years, amortized cost	117,635
Amortized Cost	141,918	144,496
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	8,144
Debt securities, maturing 5 to 10 years, fair value	13,782
Debt securities, maturing over 10 years, fair value	93,748
Debt securities, held-to-maturity, fair value	115,674	114,288
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	0
Debt securities, maturing 1 to 5 years, amortized cost	273
Debt securities, maturing 5 to 10 years, amortized cost	4,027
Debt securities, maturing over 10 years, amortized cost	252,029
Amortized Cost	256,329	248,559
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	270
Debt securities, maturing 5 to 10 years, fair value	3,627
Debt securities, maturing over 10 years, fair value	239,602
Debt securities, held-to-maturity, fair value	243,499	231,620
Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	0
Debt securities, maturing 1 to 5 years, amortized cost	12,975
Debt securities, maturing 5 to 10 years, amortized cost	34,189
Debt securities, maturing over 10 years, amortized cost	51,820
Amortized Cost	98,984	102,365
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	12,101
Debt securities, maturing 5 to 10 years, fair value	30,385
Debt securities, maturing over 10 years, fair value	43,260
Debt securities, held-to-maturity, fair value	$ 85,746	$ 85,289

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