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Reclassification of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Supplemental Comprehensive Income Disclosures [Abstract]                
Unrealized holding gains on securities arising during the period $ (21,389) $ (46,213) $ (25,150) $ (135,258)        
Reclassification adjustment for gains on securities included in net income 103 0 103 (2)        
Total unrealized gains on securities (21,286) (46,213) (25,047) (135,260)        
Unrealized holding gains on securities arising during the period 4,138 9,705 5,282 28,405        
Reclassification adjustment for gains on securities included in net income (22) 0 (22) 0        
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax 4,116 9,705 5,260 28,405        
Total other comprehensive (loss) income (19,175) (57,296) (20,711) (169,014)        
Other Comprehensive Income (Loss), Tax 3,672 12,032 4,349 35,493        
Other comprehensive income (loss) before reclassification adjustment (17,251) (36,508) (19,868) (106,853)        
Reclassification adjustment for gains on securities included in net income (81) 0 (81) 2        
Total unrealized (losses) gains on securities (17,170) (36,508) (19,787) (106,855)        
Total other comprehensive (loss) income (15,503) (45,264) (16,362) (133,521)        
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax (154,054) (142,289) (154,054) (142,289) $ (138,551) $ (137,692) $ (97,025) $ (8,768)
Other comprehensive income (loss) before reclassification adjustment (17,251) (36,508) (19,868) (106,853)        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (15,584) (45,264) (16,443) (133,519)        
Amounts reclassified from accumulated other comprehensive income (loss) 81 0 81 (2)        
Total other comprehensive (loss) income (15,503) (45,264) (16,362) (133,521)        
Unrealized holding losses on securities arising during the period (21,389) (46,213) (25,150) (135,258)        
Unrealized holding gains on securities arising during the period 4,138 9,705 5,282 28,405        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax (103) 0 (103) 2        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 22 0 22 0        
Reclassification adjustment for gains on securities included in net income (81) 0 (81) 2        
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax (21,286) (46,213) (25,047) (135,260)        
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax 4,116 9,705 5,260 28,405        
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax (17,170) (36,508) (19,787) (106,855)        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax (444) 2,327 (911) 7,088        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 2,111 (11,083) 4,336 (33,754)        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax 1,667 (8,756) 3,425 (26,666)        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax (444) 2,327 (911) 7,088        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax 2,111 (11,083) 4,336 (33,754)        
Other Comprehensive Income (Loss), before Tax (19,175) (57,296) (20,711) (169,014)        
Other Comprehensive Income (Loss), Tax 3,672 12,032 4,349 35,493        
Accumulated Net Unrealized Investment Gain (Loss) [Member]                
Supplemental Comprehensive Income Disclosures [Abstract]                
Total other comprehensive (loss) income (17,170) (36,508) (19,787) (106,855)        
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax (127,258) (110,172) (127,258) (110,172) (110,088) (107,471) (73,664) (3,317)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (17,251) (36,508) (19,868) (106,853)        
Amounts reclassified from accumulated other comprehensive income (loss) 81 0 81 (2)        
Total other comprehensive (loss) income (17,170) (36,508) (19,787) (106,855)        
Accumulated Defined Benefit Plans Adjustment [Member]                
Supplemental Comprehensive Income Disclosures [Abstract]                
Total other comprehensive (loss) income 0 0 0 0        
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax 268 95 268 95 268 268 95 95
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 0 0 0        
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0 0        
Total other comprehensive (loss) income 0 0 0 0        
Derivative [Member]                
Supplemental Comprehensive Income Disclosures [Abstract]                
Total other comprehensive (loss) income 1,667 (8,756) 3,425 (26,666)        
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax (27,064) (32,212) (27,064) (32,212) $ (28,731) $ (30,489) $ (23,456) $ (5,546)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 1,667 (8,756)            
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0 0        
Total other comprehensive (loss) income 1,667 (8,756) 3,425 (26,666)        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax 1,667 (8,756) 3,425 (26,666)        
Accumulated Other Comprehensive Income (Loss), net [Member]                
Supplemental Comprehensive Income Disclosures [Abstract]                
Total other comprehensive (loss) income (15,503) (45,264) (16,362) (133,521)        
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Total other comprehensive (loss) income $ (15,503) $ (45,264) $ (16,362) $ (133,521)