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Investments Investment Securities in Unrealized Loss Position (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
securities
Dec. 31, 2017
USD ($)
securities
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 453,440 $ 378,406
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (9,078) (2,463)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 488,716 495,297
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (25,722) (14,708)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 942,156 873,703
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses $ 34,800 $ 17,171
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities 253 208
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 48,598 $ 59,218
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,643) (534)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 16,245 14,563
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (567) (261)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 64,843 73,781
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (2,210) $ (795)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities 16 16
US Government and Government Agencies and Authorities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 9,861 $ 14,902
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (114) (79)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 23,839 19,397
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (1,247) (754)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 33,700 34,299
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses $ 1,361 $ 833
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities 6 6
US Government-sponsored Enterprises Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 212,331 $ 220,275
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (4,038) (1,350)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 57,273 38,273
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (2,239) (1,272)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 269,604 258,548
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses $ 6,277 $ 2,622
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities 40 36
Municipal Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 132,307 $ 46,112
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (1,526) (131)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 49,256 50,842
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (2,264) (1,017)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 181,563 96,954
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses $ 3,790 $ 1,148
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities 95 63
Mortgage Backed Securities, Other [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 98,941 [1] $ 97,117 [2]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (3,400) [1] (903) [2]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 358,348 [1] 386,785 [2]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (19,972) [1] (11,665) [2]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 457,289 [1] 483,902 [2]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses $ 23,372 [1] $ 12,568 [2]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities 112 [1] 103 [2]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 48,598 [1] $ 59,218 [2]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,643) [1] (534) [2]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 16,245 [1] 14,563 [2]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (567) [1] (261) [2]
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 64,843 [1] 73,781 [2]
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (2,210) [1] $ (795) [2]
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities 16 [1] 16 [2]
[1] All mortgage-backed securities are guaranteed by the U.S. government, U.S. government agencies, or government-sponsored entities.
[2] All mortgage-backed securities are guaranteed by the U.S. government, U.S. government agencies, or government-sponsored entities.