Investment Securities - Held-to-maturity Securities by Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	$ 11,191
Debt securities, maturing 1 to 5 years, amortized cost	33,990
Debt securities, maturing 5 to 10 years, amortized cost	118,441
Debt securities, maturing over 10 years, amortized cost	512,025
Amortized Cost	675,647	$ 560,453
Debt securities, maturing within 1 year, fair value	11,058
Debt securities, maturing 1 to 5 years, fair value	31,376
Debt securities, maturing 5 to 10 years, fair value	107,125
Debt securities, maturing over 10 years, fair value	420,329
Debt securities, held-to-maturity, fair value	$ 569,888	478,509
Held-to-maturity securities, maturing within 1 year, weighted average yield	2.32%
Held-to-maturity securities, maturing 1 to 5 years, weighted average yield	1.64%
Held-to-maturity securities, maturing 6 to 10 years, weighted average yield	4.04%
Held-to-maturity securities, maturing over 10 years, weighted average yield	3.43%
Held-to-maturity securities, total weighted average yield	3.43%
U.S. government sponsored agencies
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	$ 4,629
Debt securities, maturing 1 to 5 years, amortized cost	18,660
Debt securities, maturing 5 to 10 years, amortized cost	67,032
Debt securities, maturing over 10 years, amortized cost	84,378
Amortized Cost	174,699	132,366
Debt securities, maturing within 1 year, fair value	4,584
Debt securities, maturing 1 to 5 years, fair value	17,800
Debt securities, maturing 5 to 10 years, fair value	65,196
Debt securities, maturing over 10 years, fair value	73,405
Debt securities, held-to-maturity, fair value	160,985	123,020
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	5,218
Debt securities, maturing 5 to 10 years, amortized cost	9,392
Debt securities, maturing over 10 years, amortized cost	130,118
Amortized Cost	144,728	145,263
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	5,157
Debt securities, maturing 5 to 10 years, fair value	7,706
Debt securities, maturing over 10 years, fair value	91,947
Debt securities, held-to-maturity, fair value	104,810	108,776
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	646
Debt securities, maturing 5 to 10 years, amortized cost	4,453
Debt securities, maturing over 10 years, amortized cost	243,528
Amortized Cost	248,627	176,215
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	626
Debt securities, maturing 5 to 10 years, fair value	3,736
Debt securities, maturing over 10 years, fair value	214,608
Debt securities, held-to-maturity, fair value	218,970	157,998
Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	6,562
Debt securities, maturing 1 to 5 years, amortized cost	9,466
Debt securities, maturing 5 to 10 years, amortized cost	37,564
Debt securities, maturing over 10 years, amortized cost	54,001
Amortized Cost	107,593	106,609
Debt securities, maturing within 1 year, fair value	6,474
Debt securities, maturing 1 to 5 years, fair value	7,793
Debt securities, maturing 5 to 10 years, fair value	30,487
Debt securities, maturing over 10 years, fair value	40,369
Debt securities, held-to-maturity, fair value	$ 85,123	$ 88,715