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Investment (Held-to-Maturity) Securities (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investments Securities, Amortized Cost $ 392,013 $ 461,793 $ 490,426
Investment Securities, fair value 403,384 480,035 515,675
Investment Securities, Gross Unrealized Gain 14,270 20,508 26,092
Investment Securities, Gross Unrealized Loss (2,899) (2,266) (843)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]      
Investments Securities, Debt Maturities, Amortized Cost 392,013 461,793 490,426
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]      
Investment Securities, Debt Maturities, Fair Value $ 403,384 480,035 515,675
Investment Securities, Debt Maturities, Nominal Yield [Abstract]      
Investment Securities, Debt Maturities, Nominal Yield 4.26%    
Investment Securities, Pledged as Collateral [Abstract]      
Investment Securities, Pledged as Collateral, Amortized Cost $ 172,906 226,852 251,684
Investment Securities, Pledged as Collateral, Fair Value $ 174,240 $ 229,429 $ 255,097
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 167 150 105
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 141,435 $ 166,051 $ 123,272
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 11,140 12,265 3,000
Investment Securities, Continuous Unrealized Loss Position, Fair Value 152,575 178,316 126,272
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2,389 1,881 764
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 510 385 79
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 2,899 2,266 843
Fixed Maturity Securities [Member]      
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]      
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 75,412    
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 114,175    
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 151,879    
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 36,558    
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value 378,024    
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]      
Investment Securities, Debt Maturities, Less Than One Year, Fair Value 75,510    
Investment Securities, Debt Maturities, One to Five Years, Fair Value 115,969    
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 161,950    
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 35,971    
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value $ 389,400    
Investment Securities, Debt Maturities, Nominal Yield [Abstract]      
Investment Securities, Debt Maturities, Less Than One Year, Nominal Yield 2.45%    
Investment Securities, Debt Maturities, One to Five Years, Nominal Yield 3.54%    
Investment Securities, Debt Maturities, Six to Ten Years, Nominal Yield 5.69%    
Investment Securities, Debt Maturities, Over Ten Years, Nominal Yield 4.82%    
Investment Securities, Debt Maturities, Nominal Yield 4.31%    
Investment Securities, Debt Maturities, Weighted Average Maturity [1] 5.08    
Municipal and other tax-exempt securities      
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investments Securities, Amortized Cost $ 173,097 228,186 267,375
Investment Securities, fair value 174,205 230,349 270,531
Investment Securities, Gross Unrealized Gain 1,779 2,967 3,384
Investment Securities, Gross Unrealized Loss (671) (804) (228)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]      
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 60,535    
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 62,005    
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 28,117    
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 22,440    
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value 173,097    
Investments Securities, Debt Maturities, Amortized Cost 173,097 228,186 267,375
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]      
Investment Securities, Debt Maturities, Less Than One Year, Fair Value 60,487    
Investment Securities, Debt Maturities, One to Five Years, Fair Value 61,736    
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 29,038    
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 22,944    
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value 174,205    
Investment Securities, Debt Maturities, Fair Value $ 174,205 $ 230,349 $ 270,531
Investment Securities, Debt Maturities, Nominal Yield [Abstract]      
Investment Securities, Debt Maturities, Less Than One Year, Nominal Yield [2] 2.07%    
Investment Securities, Debt Maturities, One to Five Years, Nominal Yield [2] 2.58%    
Investment Securities, Debt Maturities, Six to Ten Years, Nominal Yield [2] 5.81%    
Investment Securities, Debt Maturities, Over Ten Years, Nominal Yield [2] 5.12%    
Investment Securities, Debt Maturities, Nominal Yield [2] 3.25%    
Investment Securities, Debt Maturities, Weighted Average Maturity [1] 4.02    
Investment Securities,Debt Maturities, Effective tax rate for nominal yield calculation 25.00%    
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 84 100 82
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 98,325 $ 145,960 $ 111,078
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 5,007 5,833 3,000
Investment Securities, Continuous Unrealized Loss Position, Fair Value 103,332 151,793 114,078
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 484 643 149
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 187 161 79
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 671 804 228
Other debt securities      
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investments Securities, Amortized Cost 204,927 217,716 205,016
Investment Securities, fair value 215,195 233,444 226,502
Investment Securities, Gross Unrealized Gain 12,259 17,095 22,040
Investment Securities, Gross Unrealized Loss (1,991) (1,367) (554)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]      
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 14,877    
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 52,170    
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 123,762    
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 14,118    
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value 204,927    
Investments Securities, Debt Maturities, Amortized Cost 204,927 217,716 205,016
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]      
Investment Securities, Debt Maturities, Less Than One Year, Fair Value 15,023    
Investment Securities, Debt Maturities, One to Five Years, Fair Value 54,233    
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 132,912    
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 13,027    
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value 215,195    
Investment Securities, Debt Maturities, Fair Value $ 215,195 $ 233,444 $ 226,502
Investment Securities, Debt Maturities, Nominal Yield [Abstract]      
Investment Securities, Debt Maturities, Less Than One Year, Nominal Yield 3.99%    
Investment Securities, Debt Maturities, One to Five Years, Nominal Yield 4.69%    
Investment Securities, Debt Maturities, Six to Ten Years, Nominal Yield 5.67%    
Investment Securities, Debt Maturities, Over Ten Years, Nominal Yield 4.34%    
Investment Securities, Debt Maturities, Nominal Yield 5.21%    
Investment Securities, Debt Maturities, Weighted Average Maturity [1] 5.99    
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 80 49 22
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 36,131 $ 20,091 $ 8,384
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,324 3,076 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value 39,455 23,167 8,384
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,795 1,238 554
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 196 129 0
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 1,991 1,367 554
U.S. government agency residential mortgage-backed securities      
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investments Securities, Amortized Cost 13,989 15,891 18,035
Investment Securities, fair value 13,984 16,242 18,642
Investment Securities, Gross Unrealized Gain 232 446 668
Investment Securities, Gross Unrealized Loss (237) (95) (61)
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]      
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value 13,989    
Investments Securities, Debt Maturities, Amortized Cost 13,989 15,891 18,035
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]      
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value 13,984    
Investment Securities, Debt Maturities, Fair Value $ 13,984 $ 16,242 $ 18,642
Investment Securities, Debt Maturities, Nominal Yield [Abstract]      
Investment Securities, Debt Maturities, Nominal Yield [3] 2.76%    
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 5 years    
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 3 1 1
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 6,979 $ 0 $ 3,810
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 2,809 3,356 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value 9,788 3,356 3,810
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 110 0 61
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 127 95 0
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 237 $ 95 $ 61
[1] Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.
[2] Calculated on a taxable equivalent basis using a 25 percent effective tax rate.
[3] The nominal yield on residential mortgage-backed securities is based upon prepayment assumptions at the purchase date. Actual yields earned may differ significantly based upon actual prepayments. See Quarterly Financial Summary - Unaudited for current yields on the investment securities portfolio.