Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities, fair value	$ 7,023	$ 7,368
Available-for-sale securities, at fair value	1,431,709	1,385,684
Other borrowings, fair value	10,518	10,576
Obligations of U.S. Government Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities, fair value	6,421	6,601
Available-for-sale securities, at fair value	535,893	552,893
Residential Mortgage-Backed Securities U.S. Government Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities, fair value	602	767
Available-for-sale securities, at fair value	668,455	650,097
Obligations of U.S. States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	86,521	84,726
Residential Mortgage-Backed Securities U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	137,589	94,678
Residential Mortgage-Backed Securities Non-U.S. Government Agencies or Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	145	194
U.S. corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	2,162	2,162
Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	944	934
Recurring [Member] | Fair Value [Member] | Other Borrowings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other borrowings, fair value	10,518	10,576
Recurring [Member] | Fair Value [Member] | Obligations of U.S. Government Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities, fair value	6,421	6,601
Available-for-sale securities, at fair value	535,893	552,893
Recurring [Member] | Fair Value [Member] | Residential Mortgage-Backed Securities U.S. Government Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities, fair value	602	767
Available-for-sale securities, at fair value	668,455	650,097
Recurring [Member] | Fair Value [Member] | Obligations of U.S. States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	86,521	84,726
Recurring [Member] | Fair Value [Member] | Residential Mortgage-Backed Securities U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	137,589	94,678
Recurring [Member] | Fair Value [Member] | Residential Mortgage-Backed Securities Non-U.S. Government Agencies or Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	145	194
Recurring [Member] | Fair Value [Member] | U.S. corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	2,162	2,162
Recurring [Member] | Fair Value [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	944	934
Recurring [Member] | Level 1 [Member] | Other Borrowings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other borrowings, fair value	0	0
Recurring [Member] | Level 1 [Member] | Obligations of U.S. Government Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities, fair value	0	0
Available-for-sale securities, at fair value	0	0
Recurring [Member] | Level 1 [Member] | Residential Mortgage-Backed Securities U.S. Government Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities, fair value	0	0
Available-for-sale securities, at fair value	0	0
Recurring [Member] | Level 1 [Member] | Obligations of U.S. States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Recurring [Member] | Level 1 [Member] | Residential Mortgage-Backed Securities U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Recurring [Member] | Level 1 [Member] | Residential Mortgage-Backed Securities Non-U.S. Government Agencies or Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Recurring [Member] | Level 1 [Member] | U.S. corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Recurring [Member] | Level 1 [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Recurring [Member] | Level 2 [Member] | Other Borrowings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other borrowings, fair value	10,518	10,576
Recurring [Member] | Level 2 [Member] | Obligations of U.S. Government Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities, fair value	6,421	6,601
Available-for-sale securities, at fair value	535,893	552,893
Recurring [Member] | Level 2 [Member] | Residential Mortgage-Backed Securities U.S. Government Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities, fair value	602	767
Available-for-sale securities, at fair value	668,455	650,097
Recurring [Member] | Level 2 [Member] | Obligations of U.S. States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	86,521	84,726
Recurring [Member] | Level 2 [Member] | Residential Mortgage-Backed Securities U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	137,589	94,678
Recurring [Member] | Level 2 [Member] | Residential Mortgage-Backed Securities Non-U.S. Government Agencies or Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	145	194
Recurring [Member] | Level 2 [Member] | U.S. corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	2,162	2,162
Recurring [Member] | Level 2 [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Recurring [Member] | Level 3 [Member] | Other Borrowings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other borrowings, fair value	0	0
Recurring [Member] | Level 3 [Member] | Obligations of U.S. Government Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities, fair value	0	0
Available-for-sale securities, at fair value	0	0
Recurring [Member] | Level 3 [Member] | Residential Mortgage-Backed Securities U.S. Government Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities, fair value	0	0
Available-for-sale securities, at fair value	0	0
Recurring [Member] | Level 3 [Member] | Obligations of U.S. States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Recurring [Member] | Level 3 [Member] | Residential Mortgage-Backed Securities U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Recurring [Member] | Level 3 [Member] | Residential Mortgage-Backed Securities Non-U.S. Government Agencies or Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Recurring [Member] | Level 3 [Member] | U.S. corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	0	0
Recurring [Member] | Level 3 [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	$ 944	$ 934