Investment Securities - Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value
Less than 12 months	$ 28,571	$ 17,933
12 months or more	61,541	174,791
Total	90,112	192,724
Unrealized Losses
Less than 12 months	(100)	(80)
12 months or more	(781)	(4,416)
Total	(881)	(4,496)
U.S. Treasury
Fair Value
Less than 12 months	0	0
12 months or more	0	1,952
Total	0	1,952
Unrealized Losses
Less than 12 months	0	0
12 months or more	0	(32)
Total	0	(32)
U.S. government and federal agency obligations
Fair Value
Less than 12 months	6,310	0
12 months or more	1,913	9,966
Total	8,223	9,966
Unrealized Losses
Less than 12 months	(25)	0
12 months or more	(5)	(269)
Total	(30)	(269)
Government sponsored enterprises
Fair Value
Less than 12 months	4,539	1,997
12 months or more	8,466	33,346
Total	13,005	35,343
Unrealized Losses
Less than 12 months	(6)	(3)
12 months or more	(32)	(469)
Total	(38)	(472)
Obligations of states and political subdivisions
Fair Value
Less than 12 months	9,098	5,851
12 months or more	2,891	28,832
Total	11,989	34,683
Unrealized Losses
Less than 12 months	(45)	(16)
12 months or more	(16)	(485)
Total	(61)	(501)
Mortgage-backed securities
Fair Value
Less than 12 months	8,624	10,085
12 months or more	46,968	99,321
Total	55,592	109,406
Unrealized Losses
Less than 12 months	(24)	(61)
12 months or more	(545)	(3,049)
Total	(569)	(3,110)
Other debt securities
Fair Value
Less than 12 months	0
12 months or more	0
Total	0
Unrealized Losses
Less than 12 months	0
12 months or more	0
Total	0
Bank issued trust preferred securities
Fair Value
Less than 12 months	0	0
12 months or more	1,303	1,374
Total	1,303	1,374
Unrealized Losses
Less than 12 months	0	0
12 months or more	(183)	(112)
Total	$ (183)	$ (112)