Securities, HTM Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	Jun. 30, 2019 USD ($) Position	Dec. 31, 2018 USD ($) Position
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 4,561	$ 23,293
12 months or longer	78,884	286,233
Total	83,445	309,526
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(75)	(91)
12 months or longer	(1,024)	(8,195)
Total	$ (1,099)	$ (8,286)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	1	32
12 months or longer | Position	24	118
Total | Position	25	150
Mortgage-Backed [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 0	$ 0
12 months or longer	40,748	82,579
Total	40,748	82,579
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	0	0
12 months or longer	(484)	(2,773)
Total	$ (484)	$ (2,773)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	0	0
12 months or longer | Position	4	6
Total | Position	4	6
Collateralized Mortgage Obligations [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 4,561	$ 4,386
12 months or longer	29,546	145,396
Total	34,107	149,782
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(75)	(7)
12 months or longer	(464)	(3,890)
Total	$ (539)	$ (3,897)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	1	2
12 months or longer | Position	6	26
Total | Position	7	28
State & Municipal [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 0	$ 18,907
12 months or longer	8,590	58,258
Total	8,590	77,165
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	0	(84)
12 months or longer	(76)	(1,532)
Total	$ (76)	$ (1,616)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	0	30
12 months or longer | Position	14	86
Total | Position	14	116