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Investment Securities (Details 2)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Schedule Of Available For Sale Debt Securities [Line Items]          
Amortized cost of Investment Securities available-for-sale $ 1,555,564   $ 1,555,564   $ 1,650,684
Gross Unrealized Gains 6,284   6,284   249
Gross Unrealized Losses (66,731)   (66,731)   (114,634)
Investment securities available-for-sale 1,495,117   1,495,117   1,536,299
Fair Value          
Less than 12 Months 154,330   154,330   332,417
12 months or Longer 897,436   897,436   1,150,098
Total fair value 1,051,766   1,051,766   1,482,515
Unrealized Losses          
Less than 12 Months (792)   (792)   (5,349)
12 months or Longer (65,939)   (65,939)   (109,285)
Total unrealized losses (66,731)   (66,731)   (114,634)
Proceeds from sales and gross realized gains and losses          
Proceeds from sales 73,537 $ 0 99,246 $ 0  
Gross realized gains 0 0 0 0  
Gross realized losses 1,877 $ 0 2,874 $ 0  
Investment securities pledged as collateral $ 246,180   $ 246,180   359,100
Number of available-for-sale debt securities 632   632    
Number of available-for-sale debt securities in an unrealized loss position 467   467    
U.S. Treasury and Federal agencies securities          
Schedule Of Available For Sale Debt Securities [Line Items]          
Amortized cost of Investment Securities available-for-sale $ 706,387   $ 706,387   786,417
Gross Unrealized Gains 2,644   2,644   24
Gross Unrealized Losses (9,174)   (9,174)   (28,692)
Investment securities available-for-sale 699,857   699,857   757,749
Fair Value          
Less than 12 Months 108,618   108,618   103,621
12 months or Longer 392,971   392,971   644,614
Total fair value 501,589   501,589   748,235
Unrealized Losses          
Less than 12 Months (500)   (500)   (1,324)
12 months or Longer (8,674)   (8,674)   (27,368)
Total unrealized losses (9,174)   (9,174)   (28,692)
U.S. States and political subdivisions securities          
Schedule Of Available For Sale Debt Securities [Line Items]          
Amortized cost of Investment Securities available-for-sale 106,537   106,537   86,305
Gross Unrealized Gains 1,048   1,048   33
Gross Unrealized Losses (1,905)   (1,905)   (3,706)
Investment securities available-for-sale 105,680   105,680   82,632
Fair Value          
Less than 12 Months 12,156   12,156   37,017
12 months or Longer 33,728   33,728   39,280
Total fair value 45,884   45,884   76,297
Unrealized Losses          
Less than 12 Months (121)   (121)   (670)
12 months or Longer (1,784)   (1,784)   (3,036)
Total unrealized losses (1,905)   (1,905)   (3,706)
Mortgage-backed securities - Federal agencies          
Schedule Of Available For Sale Debt Securities [Line Items]          
Amortized cost of Investment Securities available-for-sale 742,140   742,140   777,962
Gross Unrealized Gains 2,590   2,590   192
Gross Unrealized Losses (55,652)   (55,652)   (82,236)
Investment securities available-for-sale 689,078   689,078   695,918
Fair Value          
Less than 12 Months 33,556   33,556   191,779
12 months or Longer 470,737   470,737   466,204
Total fair value 504,293   504,293   657,983
Unrealized Losses          
Less than 12 Months (171)   (171)   (3,355)
12 months or Longer (55,481)   (55,481)   (78,881)
Total unrealized losses (55,652)   (55,652)   $ (82,236)
Corporate debt securities          
Schedule Of Available For Sale Debt Securities [Line Items]          
Amortized cost of Investment Securities available-for-sale 500   500    
Gross Unrealized Gains 2   2    
Gross Unrealized Losses 0   0    
Investment securities available-for-sale $ 502   $ 502