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Investment Securities - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	$ 538,692	$ 548,640
Available-for-sale investment securities, Amortized cost	538,692	548,640
Available-for-sale investment securities	542,704	547,749
Available-for-sale Securities, Gross Unrealized Gains	8,432	7,871
Available-for-sale Securities, Gross Unrealized Losses	(4,420)	(8,762)
U.S. Government agencies
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	65,994	69,005
Debt Securities, Estimated Fair Value	66,587	68,970
Available-for-sale Securities, Gross Unrealized Gains	667	242
Available-for-sale Securities, Gross Unrealized Losses	(74)	(277)
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	136,955	288,543
Debt Securities, Estimated Fair Value	143,105	290,299
Available-for-sale Securities, Gross Unrealized Gains	6,240	6,109
Available-for-sale Securities, Gross Unrealized Losses	(90)	(4,353)
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	237,210	181,785
Debt Securities, Estimated Fair Value	234,908	178,221
Available-for-sale Securities, Gross Unrealized Gains	601	484
Available-for-sale Securities, Gross Unrealized Losses	(2,903)	(4,048)
Private label residential mortgage and asset backed securities
Schedule of Available-for-sale Securities
Debt Securities, Amortized Cost	91,033	1,807
Debt Securities, Estimated Fair Value	90,681	2,843
Available-for-sale Securities, Gross Unrealized Gains	924	1,036
Available-for-sale Securities, Gross Unrealized Losses	(1,276)	0
Other equity securities
Schedule of Available-for-sale Securities
Equity Securities, Amortized Cost	7,500	7,500
Equity Securities, Estimated Fair Value	7,423	7,416
Available-for-sale Securities, Gross Unrealized Gains	0	0
Available-for-sale Securities, Gross Unrealized Losses	$ (77)	$ (84)

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