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Securities, Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Available-for-sale debt securities [Abstract]
Amortized cost	$ 583,123	$ 583,939
Gross unrealized gains	3,539	3,158
Gross unrealized losses	(5,319)	(6,061)
Fair value	581,343	581,036
Available-for-sale [Abstract]
Amortized cost	608,123	608,939
Gross unrealized gains	3,615	3,234
Gross unrealized losses	(6,037)	(6,779)
Fair value	605,701	605,394
Held-to-maturity [Abstract]
Amortized cost	858	866
Gross unrealized gains	0	1
Gross unrealized losses	0	0
Fair value	858	867
U.S. Treasury and Government Agencies [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	231,592	223,014
Gross unrealized gains	205	193
Gross unrealized losses	(615)	(743)
Fair value	231,182	222,464
State and Political Subdivisions [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	132,365	133,351
Gross unrealized gains	2,388	1,957
Gross unrealized losses	(1,295)	(1,792)
Fair value	133,458	133,516
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	219,166	227,574
Gross unrealized gains	946	1,008
Gross unrealized losses	(3,409)	(3,526)
Fair value	216,703	225,056
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]
Held-to-maturity [Abstract]
Amortized cost	858	866
Gross unrealized gains	0	1
Gross unrealized losses	0	0
Fair value	$ 858	$ 867

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