Fair Value of Financial Instruments, Assets and Liabilities Measured at Fair Value Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Securities available for sale [Abstract]
Fair Value	$ 546,466	$ 501,463
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities available for sale [Abstract]
Fair Value	0	0
Significant Other Observable Inputs (Level 2) [Member]
Securities available for sale [Abstract]
Fair Value	546,466	501,463
Significant Unobservable Inputs (Level 3) [Member]
Securities available for sale [Abstract]
Fair Value	0	0
Carrying Value [Member]
Securities available for sale [Abstract]
Fair Value	546,466	501,463
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities available for sale [Abstract]
U.S. government sponsored enterprises	0	0
State and political subdivisions	0	0
Mortgage backed securities and collateralized mortgage obligations - residential	0	0
Corporate bonds	0	0
Small Business Administration - guaranteed participation securities	0	0
Other securities	0	0
Fair Value	0	0
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Securities available for sale [Abstract]
U.S. government sponsored enterprises	148,292	152,160
State and political subdivisions	172	173
Mortgage backed securities and collateralized mortgage obligations - residential	312,946	262,032
Corporate bonds	30,258	29,938
Small Business Administration - guaranteed participation securities	54,113	56,475
Other securities	685	685
Fair Value	546,466	501,463
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Securities available for sale [Abstract]
U.S. government sponsored enterprises	0	0
State and political subdivisions	0	0
Mortgage backed securities and collateralized mortgage obligations - residential	0	0
Corporate bonds	0	0
Small Business Administration - guaranteed participation securities	0	0
Other securities	0	0
Fair Value	0	0
Recurring [Member] | Carrying Value [Member]
Securities available for sale [Abstract]
U.S. government sponsored enterprises	148,292	152,160
State and political subdivisions	172	173
Mortgage backed securities and collateralized mortgage obligations - residential	312,946	262,032
Corporate bonds	30,258	29,938
Small Business Administration - guaranteed participation securities	54,113	56,475
Other securities	685	685
Fair Value	$ 546,466	$ 501,463