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Investment Securities - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	$ 548,640	$ 470,080
Available-for-sale investment securities, Amortized cost	548,640	470,080
Available-for-sale investment securities	547,749	477,554
Available-for-sale Securities, Gross Unrealized Gains	7,871	9,406
Available-for-sale Securities, Gross Unrealized Losses	(8,762)	(1,932)
Held-to-maturity Securities, Debt Maturities [Abstract]
Amortized Cost	0	31,712
Estimated Fair Value	0	35,142
U.S. Government agencies
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	69,005	52,803
Debt Securities, Estimated Fair Value	68,970	52,901
Available-for-sale Securities, Gross Unrealized Gains	242	315
Available-for-sale Securities, Gross Unrealized Losses	(277)	(217)
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	288,543	181,785
Debt Securities, Estimated Fair Value	290,299	188,268
Available-for-sale Securities, Gross Unrealized Gains	6,109	6,779
Available-for-sale Securities, Gross Unrealized Losses	(4,353)	(296)
Held-to-maturity Securities, Debt Maturities [Abstract]
Amortized Cost		31,712
Gross Unrealized Gains		3,431
Gross Unrealized Losses		(1)
Estimated Fair Value		35,142
U.S. Government agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	181,785	225,636
Debt Securities, Estimated Fair Value	178,221	225,259
Available-for-sale Securities, Gross Unrealized Gains	484	1,042
Available-for-sale Securities, Gross Unrealized Losses	(4,048)	(1,419)
Private label residential mortgage backed securities
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	1,807	2,356
Debt Securities, Estimated Fair Value	2,843	3,590
Available-for-sale Securities, Gross Unrealized Gains	1,036	1,234
Available-for-sale Securities, Gross Unrealized Losses	0	0
Other equity securities
Schedule of Available-for-sale Securities
Equity Securities, Amortized Cost	7,500	7,500
Equity Securities, Estimated Fair Value	7,416	7,536
Available-for-sale Securities, Gross Unrealized Gains	0	36
Available-for-sale Securities, Gross Unrealized Losses	$ (84)	$ 0

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