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Investment Securities (Unrealized Position - Less than 12 Mos., 12 Mos. or Longer) (Details 4)
$ in Thousands
Jun. 30, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value $ 219,268 $ 465,117
Less Than 12 Months, Gross Unrealized Losses (2,682) (2,189)
12 Months or Longer, Fair Value 183,079 474,384
12 Months or Longer, Gross Unrealized Losses (967) (7,587)
Total Fair Value 402,347 939,501
Total Gross Unrealized Losses $ (3,649) (9,776)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Number of available for sale securities in unrealized loss positions | security 81  
Debt Securities Issued by the U.S. Treasury and Government Agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value $ 92,619 65,479
Less Than 12 Months, Gross Unrealized Losses (1,257) (188)
12 Months or Longer, Fair Value 74,224 101,761
12 Months or Longer, Gross Unrealized Losses (294) (1,259)
Total Fair Value 166,843 167,240
Total Gross Unrealized Losses (1,551) (1,447)
Debt Securities Issued by States and Political Subdivisions    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value 0 6,788
Less Than 12 Months, Gross Unrealized Losses 0 (14)
12 Months or Longer, Fair Value 86 440
12 Months or Longer, Gross Unrealized Losses 0 0
Total Fair Value 86 7,228
Total Gross Unrealized Losses 0 (14)
Debt Securities Issued by Corporations    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value 75,000 25,892
Less Than 12 Months, Gross Unrealized Losses (1,009) (326)
12 Months or Longer, Fair Value 90,000 74,693
12 Months or Longer, Gross Unrealized Losses (648) (307)
Total Fair Value 165,000 100,585
Total Gross Unrealized Losses (1,657) (633)
Residential - Government Agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value 51,649 119,271
Less Than 12 Months, Gross Unrealized Losses (416) (526)
12 Months or Longer, Fair Value 8,278 170,805
12 Months or Longer, Gross Unrealized Losses 0 (2,741)
Total Fair Value 59,927 290,076
Total Gross Unrealized Losses (416) (3,267)
Residential - U.S. Government-Sponsored Enterprises    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value 0 187,861
Less Than 12 Months, Gross Unrealized Losses 0 (816)
12 Months or Longer, Fair Value 10,491 73,720
12 Months or Longer, Gross Unrealized Losses (25) (1,058)
Total Fair Value 10,491 261,581
Total Gross Unrealized Losses (25) (1,874)
Commercial - Government Agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value   59,826
Less Than 12 Months, Gross Unrealized Losses   (319)
12 Months or Longer, Fair Value   52,965
12 Months or Longer, Gross Unrealized Losses   (2,222)
Total Fair Value   112,791
Total Gross Unrealized Losses   (2,541)
Mortgage-Backed Securities    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value 51,649 366,958
Less Than 12 Months, Gross Unrealized Losses (416) (1,661)
12 Months or Longer, Fair Value 18,769 297,490
12 Months or Longer, Gross Unrealized Losses (25) (6,021)
Total Fair Value 70,418 664,448
Total Gross Unrealized Losses $ (441) $ (7,682)