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Securities - AFS and HTM, Amortized Cost and FV (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Available for sale      
Total amortized cost $ 893,500 $ 893,500 $ 748,255
Gross Unrealized Gains 1,408 1,408 4,603
Gross Unrealized Losses (20,412) (20,412) (8,539)
Fair Value 874,496 874,496 744,319
Held to maturity      
Amortized cost 348,163 348,163 355,849
Unrealized Gains 22 22 741
Unrealized Losses (15,797) (15,797) (6,651)
Held to maturity, fair value 332,388 332,388 349,939
Unrealized net gains from equity securities   100 1,600
Equity, at fair value 21,555 21,555 21,241
Recognized net gain (loss) on equity securities 100 (400)  
US Treasury Securities      
Available for sale      
Total amortized cost 18,314 18,314 24,665
Gross Unrealized Gains     107
Gross Unrealized Losses (150) (150) (103)
Fair Value 18,164 18,164 24,669
Bonds      
Available for sale      
Total amortized cost 80,879 80,879 96,177
Gross Unrealized Gains 326 326 829
Gross Unrealized Losses (858) (858) (366)
Fair Value 80,347 80,347 96,640
Held to maturity      
Amortized cost 39,017 39,017 39,015
Unrealized Losses (2,283) (2,283) (1,188)
Held to maturity, fair value 36,734 36,734 37,827
Residential mortgage-backed Securities      
Available for sale      
Total amortized cost 379,759 379,759 246,707
Gross Unrealized Gains 81 81 538
Gross Unrealized Losses (10,627) (10,627) (3,740)
Fair Value 369,213 369,213 243,505
Held to maturity      
Amortized cost 22,804 22,804 16,130
Unrealized Gains     44
Unrealized Losses (605) (605)  
Held to maturity, fair value 22,199 22,199 16,174
Commercial mortgage-backed securities      
Available for sale      
Total amortized cost 11,760 11,760 11,966
Gross Unrealized Gains 34 34 105
Gross Unrealized Losses (205) (205) (48)
Fair Value 11,589 11,589 12,023
Held to maturity      
Amortized cost 87,296 87,296 71,373
Unrealized Gains 5 5 241
Unrealized Losses (3,065) (3,065) (735)
Held to maturity, fair value 84,236 84,236 70,879
Collateralized mortgage obligations      
Available for sale      
Total amortized cost 290,576 290,576 237,848
Gross Unrealized Gains 213 213 106
Gross Unrealized Losses (7,614) (7,614) (4,142)
Fair Value 283,175 283,175 233,812
Held to maturity      
Amortized cost 148,399 148,399 173,928
Unrealized Gains     19
Unrealized Losses (7,264) (7,264) (3,969)
Held to maturity, fair value 141,135 141,135 169,978
Corporate securities      
Available for sale      
Total amortized cost 56,647 56,647 66,868
Gross Unrealized Gains 277 277 1,819
Gross Unrealized Losses (507) (507) (25)
Fair Value 56,417 56,417 68,662
States and political subdivisions      
Available for sale      
Total amortized cost 55,565 55,565 64,024
Gross Unrealized Gains 477 477 1,099
Gross Unrealized Losses (451) (451) (115)
Fair Value 55,591 55,591 65,008
Held to maturity      
Amortized cost 50,647 50,647 55,403
Unrealized Gains 17 17 437
Unrealized Losses (2,580) (2,580) (759)
Held to maturity, fair value $ 48,084 $ 48,084 $ 55,081