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Securities, Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Available-for-sale debt securities [Abstract]
Amortized cost	$ 548,660	$ 568,381
Gross unrealized gains	8,060	5,582
Gross unrealized losses	(867)	(3,778)
Fair value	555,853	570,185
Available-for-sale [Abstract]
Amortized cost	573,660	593,381
Gross unrealized gains	8,333	5,714
Gross unrealized losses	(1,043)	(4,159)
Fair value	580,950	594,936
Held-to-maturity [Abstract]
Amortized cost	1,661	1,661
Gross unrealized gains	1	2
Gross unrealized losses	0	(12)
Fair value	1,662	1,651
U.S. Treasury and Government Agencies [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	234,521	240,434
Gross unrealized gains	1,256	311
Gross unrealized losses	(98)	(1,351)
Fair value	235,679	239,394
State and Political Subdivisions [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	121,388	125,665
Gross unrealized gains	4,465	3,707
Gross unrealized losses	(51)	(157)
Fair value	125,802	129,215
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	192,751	202,282
Gross unrealized gains	2,339	1,564
Gross unrealized losses	(718)	(2,270)
Fair value	194,372	201,576
CRA Investments Funds [Member]
Available-for-sale equity securities [Abstract]
Amortized cost	25,000	25,000
Gross unrealized gains	273	132
Gross unrealized losses	(176)	(381)
Fair value	25,097	24,751
U.S. Treasury and Government Agencies [Member]
Held-to-maturity [Abstract]
Amortized cost	480	480
Gross unrealized gains	0	0
Gross unrealized losses	0	(12)
Fair value	480	468
State and Political Subdivisions [Member]
Held-to-maturity [Abstract]
Amortized cost	1,181	1,181
Gross unrealized gains	1	2
Gross unrealized losses	0	0
Fair value	$ 1,182	$ 1,183

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