Investment Securities Available-For-Sale (Details 2) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Schedule Of Available For Sale Debt Securities [Line Items]
Total debt securities available-for-sale	$ 1,762,357	$ 1,969,171
Gross Unrealized Gains	1,162	651
Gross Unrealized Losses	(140,919)	(194,694)
Investment securities available-for-sale	1,622,600	1,775,128
Fair Value
Less than 12 Months	9,804	437,158
12 Months or Longer	1,542,830	1,300,035
Total fair value	1,552,634	1,737,193
Unrealized Losses
Less than 12 Months	(100)	(22,278)
12 Months or Longer	(140,819)	(172,416)
Total unrealized losses	(140,919)	(194,694)
Gross realized gains and losses
Gross realized gains	733	0	$ 221
Gross realized losses	(3,659)	(184)	(901)
Net realized (losses) gains	(2,926)	(184)	$ (680)
Investment securities pledged as collateral	$ 411,380	282,870
Number of available-for-sale debt securities	671
Number of available-for-sale debt securities in an unrealized loss position	597
U.S. Treasury and Federal agencies securities
Schedule Of Available For Sale Debt Securities [Line Items]
Total debt securities available-for-sale	$ 979,530	1,090,743
Gross Unrealized Gains	178	0
Gross Unrealized Losses	(56,842)	(92,145)
Investment securities available-for-sale	922,866	998,598
Fair Value
Less than 12 Months	0	164,481
12 Months or Longer	913,417	834,117
Total fair value	913,417	998,598
Unrealized Losses
Less than 12 Months	0	(6,299)
12 Months or Longer	(56,842)	(85,846)
Total unrealized losses	(56,842)	(92,145)
U.S. States and political subdivisions securities
Schedule Of Available For Sale Debt Securities [Line Items]
Total debt securities available-for-sale	97,522	130,670
Gross Unrealized Gains	508	591
Gross Unrealized Losses	(5,466)	(8,499)
Investment securities available-for-sale	92,564	122,762
Fair Value
Less than 12 Months	1,251	57,592
12 Months or Longer	69,747	38,834
Total fair value	70,998	96,426
Unrealized Losses
Less than 12 Months	(2)	(2,126)
12 Months or Longer	(5,464)	(6,373)
Total unrealized losses	(5,466)	(8,499)
Mortgage-backed securities - Federal agencies
Schedule Of Available For Sale Debt Securities [Line Items]
Total debt securities available-for-sale	676,257	730,672
Gross Unrealized Gains	476	60
Gross Unrealized Losses	(78,481)	(93,674)
Investment securities available-for-sale	598,252	637,058
Fair Value
Less than 12 Months	8,553	198,469
12 Months or Longer	550,748	426,989
Total fair value	559,301	625,458
Unrealized Losses
Less than 12 Months	(98)	(13,482)
12 Months or Longer	(78,383)	(80,192)
Total unrealized losses	(78,481)	(93,674)
Corporate debt securities
Schedule Of Available For Sale Debt Securities [Line Items]
Total debt securities available-for-sale	8,448	16,486
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(119)	(355)
Investment securities available-for-sale	8,329	16,131
Fair Value
Less than 12 Months	0	16,132
12 Months or Longer	8,329	0
Total fair value	8,329	16,132
Unrealized Losses
Less than 12 Months	0	(355)
12 Months or Longer	(119)	0
Total unrealized losses	(119)	(355)
Foreign government and other securities
Schedule Of Available For Sale Debt Securities [Line Items]
Total debt securities available-for-sale	600	600
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(11)	(21)
Investment securities available-for-sale	589	579
Fair Value
Less than 12 Months	0	484
12 Months or Longer	589	95
Total fair value	589	579
Unrealized Losses
Less than 12 Months	0	(16)
12 Months or Longer	(11)	(5)
Total unrealized losses	$ (11)	$ (21)