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Investment Securities (Details 2)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Schedule Of Available For Sale Debt Securities [Line Items]          
Total debt securities available-for-sale $ 1,403,006   $ 1,403,006   $ 1,173,268
Gross Unrealized Gains 17,085   17,085   24,660
Gross Unrealized Losses (7,069)   (7,069)   (461)
Investment securities available-for-sale 1,413,022   1,413,022   1,197,467
Fair Value          
Less than 12 Months 670,133   670,133   210,861
12 months or Longer 971   971   3,473
Total fair value 671,104   671,104   214,334
Unrealized Losses          
Less than 12 Months (7,043)   (7,043)   (451)
12 months or Longer (26)   (26)   (10)
Total unrealized losses (7,069)   (7,069)   (461)
Gross realized gains and losses          
Gross realized gains 221 $ 5 221 $ 285  
Gross realized losses (901) (6) (901) (6)  
Net realized gains (losses) (680) $ (1) (680) $ 279  
Investment securities pledged as collateral $ 326,020   $ 326,020   338,680
Number of available-for-sale debt securities 657   657    
Number of available-for-sale debt securities in an unrealized loss position 169   169    
U.S. Treasury and Federal agencies securities          
Schedule Of Available For Sale Debt Securities [Line Items]          
Total debt securities available-for-sale $ 767,147   $ 767,147   610,195
Gross Unrealized Gains 6,325   6,325   9,521
Gross Unrealized Losses (3,594)   (3,594)   (234)
Investment securities available-for-sale 769,878   769,878   619,482
Fair Value          
Less than 12 Months 405,494   405,494   136,534
12 months or Longer 0   0   0
Total fair value 405,494   405,494   136,534
Unrealized Losses          
Less than 12 Months (3,594)   (3,594)   (234)
12 months or Longer 0   0   0
Total unrealized losses (3,594)   (3,594)   (234)
U.S. States and political subdivisions securities          
Schedule Of Available For Sale Debt Securities [Line Items]          
Total debt securities available-for-sale 89,938   89,938   78,812
Gross Unrealized Gains 1,761   1,761   2,346
Gross Unrealized Losses (564)   (564)   (31)
Investment securities available-for-sale 91,135   91,135   81,127
Fair Value          
Less than 12 Months 31,702   31,702   6,391
12 months or Longer 421   421   199
Total fair value 32,123   32,123   6,590
Unrealized Losses          
Less than 12 Months (545)   (545)   (30)
12 months or Longer (19)   (19)   (1)
Total unrealized losses (564)   (564)   (31)
Mortgage-backed securities - Federal agencies          
Schedule Of Available For Sale Debt Securities [Line Items]          
Total debt securities available-for-sale 517,713   517,713   442,748
Gross Unrealized Gains 8,093   8,093   11,237
Gross Unrealized Losses (2,911)   (2,911)   (196)
Investment securities available-for-sale 522,895   522,895   453,789
Fair Value          
Less than 12 Months 232,737   232,737   67,736
12 months or Longer 550   550   3,274
Total fair value 233,287   233,287   71,010
Unrealized Losses          
Less than 12 Months (2,904)   (2,904)   (187)
12 months or Longer (7)   (7)   (9)
Total unrealized losses (2,911)   (2,911)   (196)
Corporate debt securities          
Schedule Of Available For Sale Debt Securities [Line Items]          
Total debt securities available-for-sale 27,508   27,508   40,813
Gross Unrealized Gains 906   906   1,556
Gross Unrealized Losses 0   0   0
Investment securities available-for-sale 28,414   28,414   42,369
Fair Value          
Less than 12 Months 0   0   0
12 months or Longer 0   0   0
Total fair value 0   0   0
Unrealized Losses          
Less than 12 Months 0   0   0
12 months or Longer 0   0   0
Total unrealized losses 0   0   0
Foreign government and other securities          
Schedule Of Available For Sale Debt Securities [Line Items]          
Total debt securities available-for-sale 700   700   700
Gross Unrealized Gains 0   0   0
Gross Unrealized Losses 0   0   0
Investment securities available-for-sale 700   700   700
Fair Value          
Less than 12 Months 200   200   200
12 months or Longer 0   0   0
Total fair value 200   200   200
Unrealized Losses          
Less than 12 Months 0   0   0
12 months or Longer 0   0   0
Total unrealized losses $ 0   $ 0   $ 0