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Investment Securities Gross Unrealized Losses and Fair Values of Investment Securities (Details)
$ in Thousands
Mar. 31, 2017
USD ($)
securities
Dec. 31, 2016
USD ($)
securities
Available-for-Sale:    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 977,380 $ 1,063,374
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1 (12,053) (19,560)
Available-for-Sale, 12 Months or More Fair Value 33,309 15,849
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or Longer, Aggregate Loss1 (596) (500)
Available-for-Sale, Total Fair Value 1,010,689 1,079,223
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss1 (12,649) (20,060)
Held-to-Maturity:    
Held-to-Maturity, Less than 12 Months Fair Value 136,695 203,424
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1 (8,183) (8,879)
Held-to-Maturity, 12 Months or More Fair Value 20,951 22,817
Held-to-Maturity, 12 Months or More Gross Unrealized Losses (1,274) (1,285)
Held-to-Maturity, Total Fair Value 157,646 226,241
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss1 $ (9,457) $ (10,164)
Available-for-Sale and Held-to-Maturity:    
Investment Securities in an Unrealized Loss Position (Number of Securities) | securities 319 396
US Treasury Securities [Member]    
Available-for-Sale:    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 598 $ 598
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1 (1) (1)
Available-for-Sale, 12 Months or More Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or Longer, Aggregate Loss1 0 0
Available-for-Sale, Total Fair Value 598 598
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss1 (1) (1)
Obligations of U.S. government agencies    
Available-for-Sale:    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 324,693 316,511
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1 (4,287) (6,457)
Available-for-Sale, 12 Months or More Fair Value 9,984 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or Longer, Aggregate Loss1 (15) 0
Available-for-Sale, Total Fair Value 334,677 316,511
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss1 (4,302) (6,457)
Held-to-Maturity:    
Held-to-Maturity, Less than 12 Months Fair Value 19,655 19,575
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1 (82) (162)
Held-to-Maturity, 12 Months or More Fair Value 0 0
Held-to-Maturity, 12 Months or More Gross Unrealized Losses 0 0
Held-to-Maturity, Total Fair Value 19,655 19,575
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss1 (82) (162)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations    
Available-for-Sale:    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 652,089 746,265
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1 (7,765) (13,102)
Available-for-Sale, 12 Months or More Fair Value 23,282 15,801
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or Longer, Aggregate Loss1 (580) (499)
Available-for-Sale, Total Fair Value 675,371 762,066
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss1 (8,345) (13,601)
Held-to-Maturity:    
Held-to-Maturity, Less than 12 Months Fair Value 77,626 108,857
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1 (7,816) (7,973)
Held-to-Maturity, 12 Months or More Fair Value 18,509 19,986
Held-to-Maturity, 12 Months or More Gross Unrealized Losses (1,270) (1,276)
Held-to-Maturity, Total Fair Value 96,135 128,843
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss1 (9,086) (9,249)
Private mortgage-backed securities    
Available-for-Sale:    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1 0 0
Available-for-Sale, 12 Months or More Fair Value 43 48
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 months or Longer, Aggregate Loss1 (1) (1)
Available-for-Sale, Total Fair Value 43 48
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss1 (1) (1)
State, county and municipal securities    
Held-to-Maturity:    
Held-to-Maturity, Less than 12 Months Fair Value 23,353 42,518
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1 (218) (533)
Held-to-Maturity, 12 Months or More Fair Value 2,442 2,831
Held-to-Maturity, 12 Months or More Gross Unrealized Losses (4) (9)
Held-to-Maturity, Total Fair Value 25,795 45,349
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss1 (222) (542)
Corporate securities    
Held-to-Maturity:    
Held-to-Maturity, Less than 12 Months Fair Value 16,061 32,474
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less Than 12 months, Aggregate Loss1 (67) (211)
Held-to-Maturity, 12 Months or More Fair Value 0 0
Held-to-Maturity, 12 Months or More Gross Unrealized Losses 0 0
Held-to-Maturity, Total Fair Value 16,061 32,474
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss1 $ (67) $ (211)