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Securities - AFS and HTM, Amortized Cost and FV (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Available for sale    
Total amortized cost $ 819,113 $ 748,255
Gross Unrealized Gains 2,437 4,603
Gross Unrealized Losses (14,967) (8,539)
Fair Value 806,583 744,319
Held to maturity    
Amortized cost 356,452 355,849
Unrealized Gains 93 741
Unrealized Losses (11,952) (6,651)
Held to maturity, fair value 344,593 349,939
Unrealized net gains from equity securities 1,000 1,600
Equity, at fair value 20,876 21,241
Recognized net loss on equity securities 600  
US Treasury Securities    
Available for sale    
Total amortized cost 33,642 24,665
Gross Unrealized Gains 13 107
Gross Unrealized Losses (118) (103)
Fair Value 33,537 24,669
Bonds    
Available for sale    
Total amortized cost 86,186 96,177
Gross Unrealized Gains 551 829
Gross Unrealized Losses (644) (366)
Fair Value 86,093 96,640
Held to maturity    
Amortized cost 39,016 39,015
Unrealized Losses (1,823) (1,188)
Held to maturity, fair value 37,193 37,827
Residential mortgage-backed Securities    
Available for sale    
Total amortized cost 301,658 246,707
Gross Unrealized Gains 292 538
Gross Unrealized Losses (7,682) (3,740)
Fair Value 294,268 243,505
Held to maturity    
Amortized cost 25,150 16,130
Unrealized Gains   44
Unrealized Losses (328)  
Held to maturity, fair value 24,822 16,174
Commercial mortgage-backed securities    
Available for sale    
Total amortized cost 11,874 11,966
Gross Unrealized Gains 47 105
Gross Unrealized Losses (192) (48)
Fair Value 11,729 12,023
Held to maturity    
Amortized cost 73,210 71,373
Unrealized Gains 26 241
Unrealized Losses (1,903) (735)
Held to maturity, fair value 71,333 70,879
Collateralized mortgage obligations    
Available for sale    
Total amortized cost 261,406 237,848
Gross Unrealized Gains 172 106
Gross Unrealized Losses (5,810) (4,142)
Fair Value 255,768 233,812
Held to maturity    
Amortized cost 165,513 173,928
Unrealized Gains   19
Unrealized Losses (5,947) (3,969)
Held to maturity, fair value 159,566 169,978
Corporate securities    
Available for sale    
Total amortized cost 64,848 66,868
Gross Unrealized Gains 596 1,819
Gross Unrealized Losses (297) (25)
Fair Value 65,147 68,662
States and political subdivisions    
Available for sale    
Total amortized cost 59,499 64,024
Gross Unrealized Gains 766 1,099
Gross Unrealized Losses (224) (115)
Fair Value 60,041 65,008
Held to maturity    
Amortized cost 53,563 55,403
Unrealized Gains 67 437
Unrealized Losses (1,951) (759)
Held to maturity, fair value $ 51,679 $ 55,081