Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities, fair value	$ 10,498	$ 10,991
Available-for-sale securities, at fair value	1,379,600	1,354,811
Other borrowings, fair value	11,228	11,292
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	8,104	8,275
Available-for-sale securities, at fair value	546,398	556,345
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	2,394	2,716
Available-for-sale securities, at fair value	619,026	577,472
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	69,366	67,962
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	140,970	146,678
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	302	311
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	2,125	4,633
Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	1,414	1,410
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	11,228	11,292
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	8,104	8,275
Available-for-sale securities, at fair value	546,399	556,345
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	2,394	2,716
Available-for-sale securities, at fair value	619,026	577,472
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	69,366	67,962
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	140,970	146,678
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	302	311
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	2,125	4,633
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	1,414	1,410
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	11,228	11,292
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	8,104	8,275
Available-for-sale securities, at fair value	546,399	556,345
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	2,394	2,716
Available-for-sale securities, at fair value	619,026	577,472
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	69,366	67,962
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	140,970	146,678
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	302	311
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	2,125	4,633
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	$ 1,414	$ 1,410