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Investment Securities (Details 2)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Schedule Of Available For Sale Debt Securities [Line Items]      
Total debt securities available-for-sale $ 1,281,800   $ 1,173,268
Gross Unrealized Gains 19,692   24,660
Gross Unrealized Losses (10,152)   (461)
Investment securities available-for-sale 1,291,340   1,197,467
Fair Value      
Less than 12 Months 614,244   210,861
12 months or Longer 1,159   3,473
Total fair value 615,403   214,334
Unrealized Losses      
Less than 12 Months (10,111)   (451)
12 months or Longer (41)   (10)
Total unrealized losses (10,152)   (461)
Gross realized gains and losses      
Gross realized gains 0 $ 280  
Gross realized losses 0 0  
Net realized gains (losses) 0 $ 280  
Investment securities pledged as collateral $ 354,170   338,680
Number of available-for-sale debt securities 646    
Number of available-for-sale debt securities in an unrealized loss position 152    
U.S. Treasury and Federal agencies securities      
Schedule Of Available For Sale Debt Securities [Line Items]      
Total debt securities available-for-sale $ 675,940   610,195
Gross Unrealized Gains 7,482   9,521
Gross Unrealized Losses (5,017)   (234)
Investment securities available-for-sale 678,405   619,482
Fair Value      
Less than 12 Months 368,296   136,534
12 months or Longer 0   0
Total fair value 368,296   136,534
Unrealized Losses      
Less than 12 Months (5,017)   (234)
12 months or Longer 0   0
Total unrealized losses (5,017)   (234)
U.S. States and political subdivisions securities      
Schedule Of Available For Sale Debt Securities [Line Items]      
Total debt securities available-for-sale 84,472   78,812
Gross Unrealized Gains 1,926   2,346
Gross Unrealized Losses (729)   (31)
Investment securities available-for-sale 85,669   81,127
Fair Value      
Less than 12 Months 25,027   6,391
12 months or Longer 407   199
Total fair value 25,434   6,590
Unrealized Losses      
Less than 12 Months (696)   (30)
12 months or Longer (33)   (1)
Total unrealized losses (729)   (31)
Mortgage-backed securities - Federal agencies      
Schedule Of Available For Sale Debt Securities [Line Items]      
Total debt securities available-for-sale 484,888   442,748
Gross Unrealized Gains 9,008   11,237
Gross Unrealized Losses (4,406)   (196)
Investment securities available-for-sale 489,490   453,789
Fair Value      
Less than 12 Months 220,921   67,736
12 months or Longer 752   3,274
Total fair value 221,673   71,010
Unrealized Losses      
Less than 12 Months (4,398)   (187)
12 months or Longer (8)   (9)
Total unrealized losses (4,406)   (196)
Corporate debt securities      
Schedule Of Available For Sale Debt Securities [Line Items]      
Total debt securities available-for-sale 35,800   40,813
Gross Unrealized Gains 1,276   1,556
Gross Unrealized Losses 0   0
Investment securities available-for-sale 37,076   42,369
Fair Value      
Less than 12 Months 0   0
12 months or Longer 0   0
Total fair value 0   0
Unrealized Losses      
Less than 12 Months 0   0
12 months or Longer 0   0
Total unrealized losses 0   0
Foreign government and other securities      
Schedule Of Available For Sale Debt Securities [Line Items]      
Total debt securities available-for-sale 700   700
Gross Unrealized Gains 0   0
Gross Unrealized Losses 0   0
Investment securities available-for-sale 700   700
Fair Value      
Less than 12 Months 0   200
12 months or Longer 0   0
Total fair value 0   200
Unrealized Losses      
Less than 12 Months 0   0
12 months or Longer 0   0
Total unrealized losses $ 0   $ 0