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Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Abstract]
Amortized cost	$ 597,020	$ 565,199
Gross unrealized gains	1,098	2,544
Gross unrealized losses	(12,354)	(6,340)
Fair value	585,764	561,403
Equity Securities, Available-for-sale [Abstract]
Amortized cost		25,000
Available-for-sale [Abstract]
Amortized cost	597,020	590,199
Gross unrealized gains	1,098	2,620
Gross unrealized losses	(12,354)	(7,058)
Available-for-sale securities	585,764	585,761
U.S. Treasury and Government Agencies [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized cost	249,625	211,574
Gross unrealized gains	29	170
Gross unrealized losses	(2,881)	(1,172)
Fair value	246,773	210,572
State and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized cost	129,628	144,159
Gross unrealized gains	875	2,017
Gross unrealized losses	(3,014)	(1,161)
Fair value	127,489	145,015
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized cost	217,260	208,959
Gross unrealized gains	194	357
Gross unrealized losses	(6,454)	(4,007)
Fair value	211,000	205,309
Other Debt Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized cost	507	507
Gross unrealized gains	0	0
Gross unrealized losses	(5)	0
Fair value	502	507
CRA Investments Funds [Member]
Equity Securities, Available-for-sale [Abstract]
Amortized cost	0	25,000
Gross unrealized gains	0	76
Gross unrealized losses	0	(718)
Fair value	$ 0	$ 24,358

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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