Securities - AFS in an Unrealized Loss Position (Details) $ in Thousands	Mar. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($) item
Number of Securities
Unrealized loss for less than twelve months | item	5	55
Unrealized loss for twelve months or longer | item	15	16
Total | item	20	71
Fair Value
Unrealized loss for less than twelve months	$ 20,751	$ 165,636
Unrealized loss for twelve months or longer	58,090	60,387
Total	78,841	226,023
Unrealized Loss
Unrealized loss for less than twelve months	165	599
Unrealized loss for twelve months or longer	892	427
Total	$ 1,057	$ 1,026
Bonds
Number of Securities
Unrealized loss for less than twelve months | item		2
Total | item		2
Fair Value
Unrealized loss for less than twelve months		$ 24,937
Total		24,937
Unrealized Loss
Unrealized loss for less than twelve months		64
Total		$ 64
Residential Mortgage Backed Securities
Number of Securities
Unrealized loss for less than twelve months | item		37
Unrealized loss for twelve months or longer | item		2
Total | item		39
Fair Value
Unrealized loss for less than twelve months		$ 36,187
Unrealized loss for twelve months or longer		13,683
Total		49,870
Unrealized Loss
Unrealized loss for less than twelve months		87
Unrealized loss for twelve months or longer		58
Total		$ 145
Commercial mortgage-backed securities
Number of Securities
Unrealized loss for less than twelve months | item		1
Total | item		1
Fair Value
Unrealized loss for less than twelve months		$ 9,967
Total		9,967
Unrealized Loss
Unrealized loss for less than twelve months		2
Total		$ 2
Collateralized Mortgage Obligations
Number of Securities
Unrealized loss for less than twelve months | item	4	15
Unrealized loss for twelve months or longer | item	15	13
Total | item	19	28
Fair Value
Unrealized loss for less than twelve months	$ 20,214	$ 94,545
Unrealized loss for twelve months or longer	58,090	46,217
Total	78,304	140,762
Unrealized Loss
Unrealized loss for less than twelve months	165	446
Unrealized loss for twelve months or longer	892	369
Total	$ 1,057	$ 815
States and political subdivisions
Number of Securities
Unrealized loss for less than twelve months | item	1
Unrealized loss for twelve months or longer | item		1
Total | item	1	1
Fair Value
Unrealized loss for less than twelve months	$ 537
Unrealized loss for twelve months or longer		$ 487
Total	$ 537	$ 487