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Securities - Investment Category and Length of Time in Unrealized Loss Position (Details) $ in Thousands	Dec. 31, 2018 USD ($) security	Dec. 31, 2017 USD ($) security
Number of Positions
Number of Positions, Less than 12 Months | security	168	91
Number of Positions, 12 Months or More | security	171	94
Number of Positions, Total | security	339	185
Fair Value
Fair Value, Less than 12 Months	$ 509,808	$ 190,832
Fair Value, 12 Months or More	312,698	183,115
Fair Value, Total	822,506	373,947
Unrealized Losses
Unrealized Losses, Less than 12 Months	(5,163)	(2,234)
Unrealized Losses, 12 Months or More	(13,106)	(8,254)
Unrealized Losses, Total	$ (18,269)	$ (10,488)
Obligations of other U.S. Government agencies and corporations
Number of Positions
Number of Positions, Less than 12 Months | security	0
Number of Positions, 12 Months or More | security	2
Number of Positions, Total | security	2
Fair Value
Fair Value, Less than 12 Months	$ 0
Fair Value, 12 Months or More	1,480
Fair Value, Total	1,480
Unrealized Losses
Unrealized Losses, Less than 12 Months	0
Unrealized Losses, 12 Months or More	(38)
Unrealized Losses, Total	$ (38)
Obligations of states and political subdivisions
Number of Positions
Number of Positions, Less than 12 Months | security	34	23
Number of Positions, 12 Months or More | security	26	12
Number of Positions, Total | security	60	35
Fair Value
Fair Value, Less than 12 Months	$ 22,159	$ 11,860
Fair Value, 12 Months or More	16,775	7,728
Fair Value, Total	38,934	19,588
Unrealized Losses
Unrealized Losses, Less than 12 Months	(193)	(59)
Unrealized Losses, 12 Months or More	(374)	(210)
Unrealized Losses, Total	$ (567)	$ (269)
Trust preferred securities
Number of Positions
Number of Positions, Less than 12 Months | security	0	0
Number of Positions, 12 Months or More | security	2	2
Number of Positions, Total | security	2	2
Fair Value
Fair Value, Less than 12 Months	$ 0	$ 0
Fair Value, 12 Months or More	10,633	9,388
Fair Value, Total	10,633	9,388
Unrealized Losses
Unrealized Losses, Less than 12 Months	0	0
Unrealized Losses, 12 Months or More	(1,726)	(3,054)
Unrealized Losses, Total	$ (1,726)	$ (3,054)
Other debt securities
Number of Positions
Number of Positions, Less than 12 Months | security	12	2
Number of Positions, 12 Months or More | security	3	2
Number of Positions, Total | security	15	4
Fair Value
Fair Value, Less than 12 Months	$ 19,011	$ 756
Fair Value, 12 Months or More	5,621	6,308
Fair Value, Total	24,632	7,064
Unrealized Losses
Unrealized Losses, Less than 12 Months	(88)	(12)
Unrealized Losses, 12 Months or More	(223)	(64)
Unrealized Losses, Total	$ (311)	$ (76)
Obligations of other U.S. Government agencies and corporations
Number of Positions
Number of Positions, Less than 12 Months | security		1
Number of Positions, 12 Months or More | security		2
Number of Positions, Total | security		3
Fair Value
Fair Value, Less than 12 Months		$ 497
Fair Value, 12 Months or More		1,999
Fair Value, Total		2,496
Unrealized Losses
Unrealized Losses, Less than 12 Months		(3)
Unrealized Losses, 12 Months or More		(27)
Unrealized Losses, Total		$ (30)
Government agency mortgage backed securities | Residential mortgage backed securities
Number of Positions
Number of Positions, Less than 12 Months | security	91	29
Number of Positions, 12 Months or More | security	73	44
Number of Positions, Total | security	164	73
Fair Value
Fair Value, Less than 12 Months	$ 354,731	$ 64,595
Fair Value, 12 Months or More	125,757	89,414
Fair Value, Total	480,488	154,009
Unrealized Losses
Unrealized Losses, Less than 12 Months	(3,945)	(659)
Unrealized Losses, 12 Months or More	(5,181)	(2,400)
Unrealized Losses, Total	$ (9,126)	$ (3,059)
Government agency mortgage backed securities | Commercial mortgage backed securities
Number of Positions
Number of Positions, Less than 12 Months | security	5	2
Number of Positions, 12 Months or More | security	4	3
Number of Positions, Total | security	9	5
Fair Value
Fair Value, Less than 12 Months	$ 6,506	$ 5,629
Fair Value, 12 Months or More	7,468	5,872
Fair Value, Total	13,974	11,501
Unrealized Losses
Unrealized Losses, Less than 12 Months	(74)	(17)
Unrealized Losses, 12 Months or More	(310)	(217)
Unrealized Losses, Total	$ (384)	$ (234)
Government agency collateralized mortgage obligations | Residential mortgage backed securities
Number of Positions
Number of Positions, Less than 12 Months | security	24	33
Number of Positions, 12 Months or More | security	60	29
Number of Positions, Total | security	84	62
Fair Value
Fair Value, Less than 12 Months	$ 97,451	$ 102,509
Fair Value, 12 Months or More	140,076	62,406
Fair Value, Total	237,527	164,915
Unrealized Losses
Unrealized Losses, Less than 12 Months	(840)	(1,470)
Unrealized Losses, 12 Months or More	(5,142)	(2,282)
Unrealized Losses, Total	$ (5,982)	$ (3,752)
Government agency collateralized mortgage obligations | Commercial mortgage backed securities
Number of Positions
Number of Positions, Less than 12 Months | security	2	1
Number of Positions, 12 Months or More | security	1	0
Number of Positions, Total | security	3	1
Fair Value
Fair Value, Less than 12 Months	$ 9,950	$ 4,986
Fair Value, 12 Months or More	4,888	0
Fair Value, Total	14,838	4,986
Unrealized Losses
Unrealized Losses, Less than 12 Months	(23)	(14)
Unrealized Losses, 12 Months or More	(112)	0
Unrealized Losses, Total	$ (135)	$ (14)

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