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Comprehensive Income - Components of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income (AOCI)                
Beginning balance $ 296,663 $ 291,828 $ 289,342 $ 274,297 $ 271,316 $ 261,391 $ 289,342 $ 261,391
Other comprehensive income (loss) before reclassification 5,894     (5,809)     6,773 (3,560)
Amounts reclassified from accumulated other comprehensive income (loss) 33     22     (401) 1,013
Total other comprehensive income (loss), net of tax 5,927 2,413 (1,968) (5,787) (3,526) 6,766 6,372 (2,547)
Ending balance 303,200 296,663 291,828 271,369 274,297 271,316 303,200 271,369
Accumulated other comprehensive income (loss)                
Accumulated Other Comprehensive Income (AOCI)                
Beginning balance (28,386) (30,799) (28,831) (34,464) (30,938) (37,704) (28,831) (37,704)
Total other comprehensive income (loss), net of tax 5,927 2,413 (1,968) (5,787) (3,526) 6,766    
Ending balance (22,459) (28,386) (30,799) (40,251) (34,464) (30,938) (22,459) (40,251)
Unrealized gains (losses) on available for-sale securities                
Accumulated Other Comprehensive Income (AOCI)                
Beginning balance (26,176)   (25,871) (31,674)   (34,829) (25,871) (34,829)
Other comprehensive income (loss) before reclassification 6,271     (5,885)     6,466 (3,897)
Amounts reclassified from accumulated other comprehensive income (loss) 0     0     (500) 1,167
Total other comprehensive income (loss), net of tax 6,271     (5,885)     5,966 (2,730)
Ending balance (19,905) (26,176)   (37,559) (31,674)   (19,905) (37,559)
Defined benefit pension plan items                
Accumulated Other Comprehensive Income (AOCI)                
Beginning balance (2,244)   (2,994) (2,824)   (3,129) (2,994) (3,129)
Other comprehensive income (loss) before reclassification (377)     76     307 337
Amounts reclassified from accumulated other comprehensive income (loss) 33     22     99 66
Total other comprehensive income (loss), net of tax (344)     98     406 403
Ending balance (2,588) (2,244)   (2,726) (2,824)   (2,588) (2,726)
Investment hedge                
Accumulated Other Comprehensive Income (AOCI)                
Beginning balance 34   $ 34 34   $ 254 34 254
Other comprehensive income (loss) before reclassification 0     0     0 0
Amounts reclassified from accumulated other comprehensive income (loss) 0     0     0 (220)
Total other comprehensive income (loss), net of tax 0     0     0 (220)
Ending balance $ 34 $ 34   $ 34 $ 34   $ 34 $ 34