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Investment Securities (Details 2)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Schedule Of Available For Sale Debt Securities [Line Items]          
Total debt securities available-for-sale $ 2,014,244   $ 2,014,244   $ 1,876,031
Gross Unrealized Gains 4   4   9,618
Gross Unrealized Losses (213,054)   (213,054)   (22,608)
Investment securities available-for-sale 1,801,194   1,801,194   1,863,041
Fair Value          
Less than 12 Months 773,967   773,967   1,284,132
12 months or Longer 1,024,804   1,024,804   124,298
Total fair value 1,798,771   1,798,771   1,408,430
Unrealized Losses          
Less than 12 Months (63,919)   (63,919)   (19,022)
12 months or Longer (149,135)   (149,135)   (3,586)
Total unrealized losses (213,054)   (213,054)   (22,608)
Gross realized gains and losses          
Gross realized gains 0 $ 0 0 $ 221  
Gross realized losses 0 0 0 (901)  
Net realized (losses) gains 0 $ 0 0 $ (680)  
Investment securities pledged as collateral $ 264,350   $ 264,350   351,130
Number of available-for-sale debt securities 748   748    
Number of available-for-sale debt securities in an unrealized loss position 728   728    
U.S. Treasury and Federal agencies securities          
Schedule Of Available For Sale Debt Securities [Line Items]          
Total debt securities available-for-sale $ 1,131,244   $ 1,131,244   1,093,780
Gross Unrealized Gains 0   0   3,244
Gross Unrealized Losses (99,667)   (99,667)   (13,018)
Investment securities available-for-sale 1,031,577   1,031,577   1,084,006
Fair Value          
Less than 12 Months 344,947   344,947   789,536
12 months or Longer 686,630   686,630   84,191
Total fair value 1,031,577   1,031,577   873,727
Unrealized Losses          
Less than 12 Months (19,238)   (19,238)   (10,728)
12 months or Longer (80,429)   (80,429)   (2,290)
Total unrealized losses (99,667)   (99,667)   (13,018)
U.S. States and political subdivisions securities          
Schedule Of Available For Sale Debt Securities [Line Items]          
Total debt securities available-for-sale 126,008   126,008   95,700
Gross Unrealized Gains 0   0   1,130
Gross Unrealized Losses (10,777)   (10,777)   (1,129)
Investment securities available-for-sale 115,231   115,231   95,701
Fair Value          
Less than 12 Months 80,326   80,326   39,585
12 months or Longer 33,630   33,630   4,875
Total fair value 113,956   113,956   44,460
Unrealized Losses          
Less than 12 Months (5,194)   (5,194)   (980)
12 months or Longer (5,583)   (5,583)   (149)
Total unrealized losses (10,777)   (10,777)   (1,129)
Mortgage-backed securities - Federal agencies          
Schedule Of Available For Sale Debt Securities [Line Items]          
Total debt securities available-for-sale 739,896   739,896   663,441
Gross Unrealized Gains 4   4   4,745
Gross Unrealized Losses (102,210)   (102,210)   (8,459)
Investment securities available-for-sale 637,690   637,690   659,727
Fair Value          
Less than 12 Months 332,094   332,094   454,413
12 months or Longer 304,448   304,448   35,232
Total fair value 636,542   636,542   489,645
Unrealized Losses          
Less than 12 Months (39,091)   (39,091)   (7,312)
12 months or Longer (63,119)   (63,119)   (1,147)
Total unrealized losses (102,210)   (102,210)   (8,459)
Corporate debt securities          
Schedule Of Available For Sale Debt Securities [Line Items]          
Total debt securities available-for-sale 16,496   16,496   22,510
Gross Unrealized Gains 0   0   499
Gross Unrealized Losses (383)   (383)   0
Investment securities available-for-sale 16,113   16,113   23,009
Fair Value          
Less than 12 Months 16,113   16,113   0
12 months or Longer 0   0   0
Total fair value 16,113   16,113   0
Unrealized Losses          
Less than 12 Months (383)   (383)   0
12 months or Longer 0   0   0
Total unrealized losses (383)   (383)   0
Foreign government and other securities          
Schedule Of Available For Sale Debt Securities [Line Items]          
Total debt securities available-for-sale 600   600   600
Gross Unrealized Gains 0   0   0
Gross Unrealized Losses (17)   (17)   (2)
Investment securities available-for-sale 583   583   598
Fair Value          
Less than 12 Months 487   487   598
12 months or Longer 96   96   0
Total fair value 583   583   598
Unrealized Losses          
Less than 12 Months (13)   (13)   (2)
12 months or Longer (4)   (4)   0
Total unrealized losses $ (17)   $ (17)   $ (2)