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Securities, Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Available-for-sale Debt Securities [Abstract]
Amortized cost	$ 602,114	$ 565,199
Gross unrealized gains		2,544
Gross unrealized losses		(6,340)
Fair value	593,746	561,403
Available-for-sale Equity Securities [Abstract]
Amortized cost		25,000
Securities Available-for-Sale [Abstract]
Amortized cost	602,114	590,199
Gross unrealized gains	1,078	2,620
Gross unrealized losses	(9,446)	(7,058)
Fair value	593,746	585,761
U.S. Treasury and Government Agencies [Member]
Available-for-sale Debt Securities [Abstract]
Amortized cost	219,358	211,574
Gross unrealized gains	48	170
Gross unrealized losses	(1,468)	(1,172)
Fair value	217,938	210,572
State and Political Subdivisions [Member]
Available-for-sale Debt Securities [Abstract]
Amortized cost	126,280	144,159
Gross unrealized gains	633	2,017
Gross unrealized losses	(2,425)	(1,161)
Fair value	124,488	145,015
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale Debt Securities [Abstract]
Amortized cost	255,969	208,959
Gross unrealized gains	397	357
Gross unrealized losses	(5,547)	(4,007)
Fair value	250,819	205,309
Other Debt Securities [Member]
Available-for-sale Debt Securities [Abstract]
Amortized cost	507	507
Gross unrealized gains	0	0
Gross unrealized losses	(6)	0
Fair value	$ 501	507
CRA Investments Funds [Member]
Available-for-sale Equity Securities [Abstract]
Amortized cost		25,000
Gross unrealized gains		76
Gross unrealized losses		(718)
Fair value		$ 24,358

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