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Investment Securities Available-For-Sale (Details 2)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Schedule Of Available For Sale Debt Securities [Line Items]      
Total debt securities available-for-sale $ 1,173,268 $ 1,033,771  
Gross Unrealized Gains 24,660 8,424  
Gross Unrealized Losses (461) (1,612)  
Investment securities available-for-sale 1,197,467 1,040,583  
Fair Value      
Less than 12 Months 210,861 178,586  
12 Months or Longer 3,473 129,351  
Total fair value 214,334 307,937  
Unrealized Losses      
Less than 12 Months (451) (661)  
12 Months or Longer (10) (951)  
Total unrealized losses (461) (1,612)  
Gross realized gains and losses      
Gross realized gains 285 0 $ 2
Gross realized losses (6) 0 (347)
Net realized (losses) gains 279 0 $ (345)
Investment securities pledged as collateral $ 338,680 281,380  
Number of available-for-sale debt securities 623    
Number of available-for-sale debt securities in an unrealized loss position 54    
U.S. Treasury and Federal agencies securities      
Schedule Of Available For Sale Debt Securities [Line Items]      
Total debt securities available-for-sale $ 610,195 524,896  
Gross Unrealized Gains 9,521 2,538  
Gross Unrealized Losses (234) (470)  
Investment securities available-for-sale 619,482 526,964  
Fair Value      
Less than 12 Months 136,534 87,352  
12 Months or Longer 0 69,053  
Total fair value 136,534 156,405  
Unrealized Losses      
Less than 12 Months (234) (171)  
12 Months or Longer 0 (299)  
Total unrealized losses (234) (470)  
U.S. States and political subdivisions securities      
Schedule Of Available For Sale Debt Securities [Line Items]      
Total debt securities available-for-sale 78,812 83,566  
Gross Unrealized Gains 2,346 1,048  
Gross Unrealized Losses (31) (109)  
Investment securities available-for-sale 81,127 84,505  
Fair Value      
Less than 12 Months 6,391 9,283  
12 Months or Longer 199 1,042  
Total fair value 6,590 10,325  
Unrealized Losses      
Less than 12 Months (30) (107)  
12 Months or Longer (1) (2)  
Total unrealized losses (31) (109)  
Mortgage-backed securities - Federal agencies      
Schedule Of Available For Sale Debt Securities [Line Items]      
Total debt securities available-for-sale 442,748 372,458  
Gross Unrealized Gains 11,237 3,948  
Gross Unrealized Losses (196) (1,017)  
Investment securities available-for-sale 453,789 375,389  
Fair Value      
Less than 12 Months 67,736 81,951  
12 Months or Longer 3,274 51,165  
Total fair value 71,010 133,116  
Unrealized Losses      
Less than 12 Months (187) (383)  
12 Months or Longer (9) (634)  
Total unrealized losses (196) (1,017)  
Corporate debt securities      
Schedule Of Available For Sale Debt Securities [Line Items]      
Total debt securities available-for-sale 40,813 52,151  
Gross Unrealized Gains 1,556 890  
Gross Unrealized Losses 0 (16)  
Investment securities available-for-sale 42,369 53,025  
Fair Value      
Less than 12 Months 0 0  
12 Months or Longer 0 8,091  
Total fair value 0 8,091  
Unrealized Losses      
Less than 12 Months 0 0  
12 Months or Longer 0 (16)  
Total unrealized losses 0 (16)  
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 200 0  
12 Months or Longer 0 0  
Total fair value 200 0  
Unrealized Losses      
Less than 12 Months 0 0  
12 Months or Longer 0 0  
Total unrealized losses $ 0 $ 0