Securities, AFS Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	Mar. 31, 2020 USD ($) Position	Dec. 31, 2019 USD ($) Position
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 48,520	$ 198,501
12 months or longer	3,950	97,243
Total	52,470	295,744
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(166)	(718)
12 months or longer	(52)	(815)
Total	$ (218)	$ (1,533)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	16	48
12 months or longer | Position	3	34
Total | Position	19	82
Federal Agency [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months		$ 14,891
12 months or longer		9,866
Total		24,757
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months		(109)
12 months or longer		(134)
Total		$ (243)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position		2
12 months or longer | Position		1
Total | Position		3
State & Municipal [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months		$ 2,503
12 months or longer		0
Total		2,503
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months		(20)
12 months or longer		0
Total		$ (20)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position		1
12 months or longer | Position		0
Total | Position		1
Mortgage-Backed [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 6,003	$ 67,986
12 months or longer	789	37,745
Total	6,792	105,731
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(46)	(273)
12 months or longer	(9)	(122)
Total	$ (55)	$ (395)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	3	21
12 months or longer | Position	2	16
Total | Position	5	37
Collateralized Mortgage Obligations [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 42,517	$ 113,121
12 months or longer	3,161	49,632
Total	45,678	162,753
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(120)	(316)
12 months or longer	(43)	(559)
Total	$ (163)	$ (875)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	13	24
12 months or longer | Position	1	17
Total | Position	14	41