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Accumulated Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Other comprehensive income (loss), Pre-tax Amount $ (36,187)     $ (55,739)     $ (32,134) $ (172,060)
Other comprehensive income (loss), Tax Effect (9,270)     (14,281)     (8,232) (44,084)
Total other comprehensive loss, net of tax (26,917) $ (7,100) $ 10,115 (41,458) $ (32,631) $ (53,887) (23,902) (127,976)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Including Noncontrolling Interest [Member]                
Other comprehensive loss, before Reclassifications, Pre-tax Amount (36,914)     (57,655)     (34,279) (177,638)
Reclassification, Pre-tax Amount 16 [1]     23 [2]     51 [1] 95 [2]
Other comprehensive income (loss), Pre-tax Amount (36,898)     (57,632)     (34,228) (177,543)
Other comprehensive income (loss), before Reclassifications, Tax Effect (9,457)     (14,773)     (8,782) (45,514)
Reclassification, Tax Effect 4 [1]     7 [2]     13 [1] 25 [2]
Other comprehensive income (loss), Tax Effect (9,453)     (14,766)     (8,769) (45,489)
Other comprehensive income (loss), before Reclassifications, Net-of-tax Amount (27,457)     (42,882)     (25,497) (132,124)
Reclassification, Net of tax amount 12 [1]     16 [2]     38 [1] 70 [2]
Total other comprehensive loss, net of tax (27,445)     (42,866)     (25,459) (132,054)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]                
Other comprehensive income (loss), Pre-tax Amount 518     1,829     1,514 5,291
Other comprehensive income (loss), Tax Effect 133     469     388 1,356
Total other comprehensive loss, net of tax 385     1,360     1,126 3,935
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest [Member]                
Other comprehensive income (loss), Pre-tax Amount (123)     0     (368) 0
Other comprehensive income (loss), Tax Effect (31)     0     (94) 0
Total other comprehensive loss, net of tax (92)     0     (274) 0
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]                
Other comprehensive income (loss), Pre-tax Amount 316     64     948 192
Other comprehensive income (loss), Tax Effect 81     16     243 49
Total other comprehensive loss, net of tax 235     48     705 143
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]                
Other comprehensive income (loss), Pre-tax Amount 193     64     580 192
Other comprehensive income (loss), Tax Effect 50     16     149 49
Total other comprehensive loss, net of tax $ 143     $ 48     $ 431 $ 143
[1] Includes amounts related to the amortization/accretion of unrealized net gains and losses related to the Company’s reclassification of available for sale investment securities to the held to maturity category. The unrealized net gains/losses will be amortized/accreted over the remaining life of the investment securities as an adjustment of yield.
[2] Includes amounts related to the amortization/accretion of unrealized net gains and losses related to the Company’s reclassification of available for sale investment securities to the held to maturity category. The unrealized net gains/losses will be amortized/accreted over the remaining life of the investment securities as an adjustment of yield.