Securities - Securities with Unrealized Losses Aggregated by Investment Category and Time with Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]
Less than 12 months, fair value	$ 777	$ 1,812
Less than 12 months, unrealized losses	3	29
More than 12 months, fair value	490,709	501,940
More than 12 months, unrealized losses	67,515	69,626
Total, fair value	491,486	503,752
Total, unrealized losses	67,518	69,655
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	79,276	80,194
More than 12 months, unrealized losses	10,953	10,151
Total, fair value	79,276	80,194
Total, unrealized losses	10,953	10,151
State and Municipal [Member]
Debt and Equity Securities, FV-NI [Line Items]
Less than 12 months, fair value	0	557
Less than 12 months, unrealized losses	0	6
More than 12 months, fair value	230,928	234,125
More than 12 months, unrealized losses	32,511	35,230
Total, fair value	230,928	234,682
Total, unrealized losses	32,511	35,236
Mortgage-backed [Member]
Debt and Equity Securities, FV-NI [Line Items]
Less than 12 months, fair value	777	1,255
Less than 12 months, unrealized losses	3	23
More than 12 months, fair value	169,823	176,400
More than 12 months, unrealized losses	23,754	23,882
Total, fair value	170,600	177,655
Total, unrealized losses	23,757	23,905
Corporate [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	204	204
More than 12 months, unrealized losses	46	46
Total, fair value	204	204
Total, unrealized losses	46	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	10,478	11,017
More than 12 months, unrealized losses	251	317
Total, fair value	10,478	11,017
Total, unrealized losses	$ 251	$ 317

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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