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Investment Securities (Unrealized Position - Less than 12 Mos., 12 Mos. or Longer) (Details 4)
$ in Thousands
Mar. 31, 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 $ 253,574 $ 465,117
Less Than 12 Months, Gross Unrealized Losses (3,711) (2,189)
12 Months or Longer, Fair Value 230,881 474,384
12 Months or Longer, Gross Unrealized Losses (5,121) (7,587)
Total Fair Value 484,455 939,501
Total Gross Unrealized Losses $ (8,832) (9,776)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Number of available for sale securities in unrealized loss positions | security 97  
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 $ 97,978 65,479
Less Than 12 Months, Gross Unrealized Losses (1,126) (188)
12 Months or Longer, Fair Value 53,511 101,761
12 Months or Longer, Gross Unrealized Losses (112) (1,259)
Total Fair Value 151,489 167,240
Total Gross Unrealized Losses (1,238) (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 355 440
12 Months or Longer, Gross Unrealized Losses (1) 0
Total Fair Value 355 7,228
Total Gross Unrealized Losses (1) (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 50,000 25,892
Less Than 12 Months, Gross Unrealized Losses (644) (326)
12 Months or Longer, Fair Value 100,866 74,693
12 Months or Longer, Gross Unrealized Losses (4,502) (307)
Total Fair Value 150,866 100,585
Total Gross Unrealized Losses (5,146) (633)
Residential - Government Agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value 54,491 119,271
Less Than 12 Months, Gross Unrealized Losses (1,072) (526)
12 Months or Longer, Fair Value 65,155 170,805
12 Months or Longer, Gross Unrealized Losses (340) (2,741)
Total Fair Value 119,646 290,076
Total Gross Unrealized Losses (1,412) (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 10,994 73,720
12 Months or Longer, Gross Unrealized Losses (166) (1,058)
Total Fair Value 10,994 261,581
Total Gross Unrealized Losses (166) (1,874)
Commercial - Government Agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value 51,105 59,826
Less Than 12 Months, Gross Unrealized Losses (869) (319)
12 Months or Longer, Fair Value 0 52,965
12 Months or Longer, Gross Unrealized Losses 0 (2,222)
Total Fair Value 51,105 112,791
Total Gross Unrealized Losses (869) (2,541)
Mortgage-Backed Securities    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Less Than 12 Months, Fair Value 105,596 366,958
Less Than 12 Months, Gross Unrealized Losses (1,941) (1,661)
12 Months or Longer, Fair Value 76,149 297,490
12 Months or Longer, Gross Unrealized Losses (506) (6,021)
Total Fair Value 181,745 664,448
Total Gross Unrealized Losses $ (2,447) $ (7,682)