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Securities - AFS and HTM, Amortized Cost and FV (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Available for sale      
Total amortized cost $ 826,515 $ 826,515 $ 748,255
Gross Unrealized Gains 1,914 1,914 4,603
Gross Unrealized Losses (17,211) (17,211) (8,539)
Fair Value 811,218 811,218 744,319
Held to maturity      
Amortized cost 353,192 353,192 355,849
Unrealized Gains 69 69 741
Unrealized Losses (13,559) (13,559) (6,651)
Held to maturity, fair value 339,702 339,702 349,939
Unrealized net gains from equity securities   1,000 1,600
Equity, at fair value 21,218 21,218 21,241
Recognized net gain (loss) on equity securities 100 (500)  
US Treasury Securities      
Available for sale      
Total amortized cost 34,671 34,671 24,665
Gross Unrealized Gains     107
Gross Unrealized Losses (123) (123) (103)
Fair Value 34,548 34,548 24,669
Bonds      
Available for sale      
Total amortized cost 70,258 70,258 96,177
Gross Unrealized Gains 417 417 829
Gross Unrealized Losses (736) (736) (366)
Fair Value 69,939 69,939 96,640
Held to maturity      
Amortized cost 39,016 39,016 39,015
Unrealized Losses (2,007) (2,007) (1,188)
Held to maturity, fair value 37,009 37,009 37,827
Residential mortgage-backed Securities      
Available for sale      
Total amortized cost 311,305 311,305 246,707
Gross Unrealized Gains 232 232 538
Gross Unrealized Losses (8,749) (8,749) (3,740)
Fair Value 302,788 302,788 243,505
Held to maturity      
Amortized cost 24,051 24,051 16,130
Unrealized Gains     44
Unrealized Losses (483) (483)  
Held to maturity, fair value 23,568 23,568 16,174
Commercial mortgage-backed securities      
Available for sale      
Total amortized cost 11,817 11,817 11,966
Gross Unrealized Gains 11 11 105
Gross Unrealized Losses (250) (250) (48)
Fair Value 11,578 11,578 12,023
Held to maturity      
Amortized cost 79,776 79,776 71,373
Unrealized Gains     241
Unrealized Losses (2,509) (2,509) (735)
Held to maturity, fair value 77,267 77,267 70,879
Collateralized mortgage obligations      
Available for sale      
Total amortized cost 283,370 283,370 237,848
Gross Unrealized Gains 266 266 106
Gross Unrealized Losses (6,594) (6,594) (4,142)
Fair Value 277,042 277,042 233,812
Held to maturity      
Amortized cost 157,000 157,000 173,928
Unrealized Gains     19
Unrealized Losses (6,646) (6,646) (3,969)
Held to maturity, fair value 150,354 150,354 169,978
Corporate securities      
Available for sale      
Total amortized cost 57,162 57,162 66,868
Gross Unrealized Gains 331 331 1,819
Gross Unrealized Losses (505) (505) (25)
Fair Value 56,988 56,988 68,662
States and political subdivisions      
Available for sale      
Total amortized cost 57,932 57,932 64,024
Gross Unrealized Gains 657 657 1,099
Gross Unrealized Losses (254) (254) (115)
Fair Value 58,335 58,335 65,008
Held to maturity      
Amortized cost 53,349 53,349 55,403
Unrealized Gains 69 69 437
Unrealized Losses (1,914) (1,914) (759)
Held to maturity, fair value $ 51,504 $ 51,504 $ 55,081