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Securities, Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Available-for-sale Debt Securities [Abstract]
Amortized cost	$ 565,199	$ 583,939
Gross unrealized gains	2,544	3,158
Gross unrealized losses	(6,340)	(6,061)
Fair value	561,403	581,036
Available-for-sale Equity Securities [Abstract]
Amortized cost	25,000
Securities Available-for-Sale [Abstract]
Amortized cost	590,199	608,939
Gross unrealized gains	2,620	3,234
Gross unrealized losses	(7,058)	(6,779)
Available-for-sale securities	585,761	605,394
Securities Held-to-Maturity [Abstract]
Amortized cost	659	866
Gross unrealized gains	1	1
Gross unrealized losses	0	0
Fair value	660	867
U.S. Treasury and Government Agencies [Member]
Available-for-sale Debt Securities [Abstract]
Amortized cost	211,574	223,014
Gross unrealized gains	170	193
Gross unrealized losses	(1,172)	(743)
Fair value	210,572	222,464
State and Political Subdivisions [Member]
Available-for-sale Debt Securities [Abstract]
Amortized cost	144,159	133,351
Gross unrealized gains	2,017	1,957
Gross unrealized losses	(1,161)	(1,792)
Fair value	145,015	133,516
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale Debt Securities [Abstract]
Amortized cost	208,959	227,574
Gross unrealized gains	357	1,008
Gross unrealized losses	(4,007)	(3,526)
Fair value	205,309	225,056
Other Debt Securities [Member]
Available-for-sale Debt Securities [Abstract]
Amortized cost	507	0
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	507	0
CRA Investments Funds [Member]
Available-for-sale Equity Securities [Abstract]
Amortized cost	25,000	25,000
Gross unrealized gains	76	76
Gross unrealized losses	(718)	(718)
Fair value	24,358	24,358
State and Political Subdivisions [Member]
Securities Held-to-Maturity [Abstract]
Amortized cost	659	866
Gross unrealized gains	1	1
Gross unrealized losses	0	0
Fair value	$ 660	$ 867

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