Securities - Securities with Unrealized Losses Aggregated by Investment Category and Time with Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]
Less than 12 months, fair value	$ 4,628	$ 153,118
Less than 12 months, unrealized losses	195	15,751
More than 12 months, fair value	476,167	375,245
More than 12 months, unrealized losses	91,997	73,290
Total, fair value	480,795	528,363
Total, unrealized losses	92,192	89,041
U.S. Treasury Notes and Bonds [Member]
Debt and Equity Securities, FV-NI [Line Items]
Less than 12 months, fair value	0	0
Less than 12 months, unrealized losses	0	0
More than 12 months, fair value	77,032	78,204
More than 12 months, unrealized losses	13,431	12,606
Total, fair value	77,032	78,204
Total, unrealized losses	13,431	12,606
State and Municipal [Member]
Debt and Equity Securities, FV-NI [Line Items]
Less than 12 months, fair value	529	89,158
Less than 12 months, unrealized losses	35	12,612
More than 12 months, fair value	212,185	140,390
More than 12 months, unrealized losses	48,227	34,939
Total, fair value	212,714	229,548
Total, unrealized losses	48,262	47,551
Mortgage-backed [Member]
Debt and Equity Securities, FV-NI [Line Items]
Less than 12 months, fair value	4,099	63,249
Less than 12 months, unrealized losses	160	3,093
More than 12 months, fair value	174,956	144,318
More than 12 months, unrealized losses	29,898	25,047
Total, fair value	179,055	207,567
Total, unrealized losses	30,058	28,140
Corporate [Member]
Debt and Equity Securities, FV-NI [Line Items]
Less than 12 months, fair value	0	711
Less than 12 months, unrealized losses	0	46
More than 12 months, fair value	709	0
More than 12 months, unrealized losses	51	0
Total, fair value	709	711
Total, unrealized losses	51	46
Asset-backed Securities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Less than 12 months, fair value	0	0
Less than 12 months, unrealized losses	0	0
More than 12 months, fair value	11,285	12,333
More than 12 months, unrealized losses	390	698
Total, fair value	11,285	12,333
Total, unrealized losses	$ 390	$ 698

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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