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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 80,463 $ 43,714
Gross Unrealized Gains 56 63
Gross Unrealized Losses (880) (336)
Fair Value 79,639 43,441
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 463,143 450,915
Gross Unrealized Gains 2,079 3,698
Gross Unrealized Losses (4,425) (2,843)
Fair Value 460,797 451,770
Obligations of U.S. Government-sponsored enterprises    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 107,312 98,699
Gross Unrealized Gains 348 309
Gross Unrealized Losses 0 0
Fair Value 107,660 99,008
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 36,486 40,700
Gross Unrealized Gains 630 1,343
Gross Unrealized Losses (485) (342)
Fair Value 36,631 41,701
Residential mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 319,345 311,516
Gross Unrealized Gains 1,101 2,046
Gross Unrealized Losses (3,940) (2,501)
Fair Value 316,506 311,061
Obligations of states and political subdivisions    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 14,759 14,831
Gross Unrealized Gains 11 63
Gross Unrealized Losses (242) (50)
Fair Value 14,528 14,844
Residential mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 65,704 28,883
Gross Unrealized Gains 45 0
Gross Unrealized Losses (638) (286)
Fair Value $ 65,111 $ 28,597