Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers between Level 1 to Level 2	$ 0	$ 0
ASSETS
Total securities available-for-sale	713,198,000	693,487,000
US Treasury Securities
ASSETS
Total securities available-for-sale	24,837,000	24,811,000
Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	221,708,000	232,179,000
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	125,155,000	129,777,000
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	35,824,000	37,358,000
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	161,977,000	125,604,000
Obligations of States and Political Subdivisions
ASSETS
Total securities available-for-sale	132,297,000	132,509,000
Marketable Equity Securities
ASSETS
Total securities available-for-sale	11,400,000	11,249,000
Fair Value Measurements, Recurring
ASSETS
Total securities available-for-sale	713,198,000	693,487,000
Trading securities held in a Rabbi Trust	4,674,000	4,410,000
Total securities	717,872,000	697,897,000
Total Assets	723,720,000	705,093,000
LIABILITIES
Total Liabilities	5,415,000	6,985,000
Fair Value Measurements, Recurring \| Interest rate swap contracts - commercial loans
ASSETS
Derivative financial assets	5,379,000	6,960,000
LIABILITIES
Derivative financial liabilities	5,352,000	6,958,000
Fair Value Measurements, Recurring \| Interest rate lock commitments - mortgage loans
ASSETS
Derivative financial assets	469,000	236,000
Fair Value Measurements, Recurring \| Forward sale contracts - mortgage loans
LIABILITIES
Derivative financial liabilities	63,000	27,000
Fair Value Measurements, Recurring \| US Treasury Securities
ASSETS
Total securities available-for-sale	24,837,000	24,811,000
Fair Value Measurements, Recurring \| Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	221,708,000	232,179,000
Fair Value Measurements, Recurring \| Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	125,155,000	129,777,000
Fair Value Measurements, Recurring \| Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	35,824,000	37,358,000
Fair Value Measurements, Recurring \| Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	161,977,000	125,604,000
Fair Value Measurements, Recurring \| Obligations of States and Political Subdivisions
ASSETS
Total securities available-for-sale	132,297,000	132,509,000
Fair Value Measurements, Recurring \| Marketable Equity Securities
ASSETS
Total securities available-for-sale	11,400,000	11,249,000
Fair Value Measurements, Recurring \| Level 1
ASSETS
Total securities available-for-sale	0	0
Trading securities held in a Rabbi Trust	4,674,000	4,410,000
Total securities	4,674,000	4,410,000
Total Assets	4,674,000	4,410,000
LIABILITIES
Total Liabilities	0	0
Fair Value Measurements, Recurring \| Level 1 \| Interest rate swap contracts - commercial loans
ASSETS
Derivative financial assets	0	0
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements, Recurring \| Level 1 \| Interest rate lock commitments - mortgage loans
ASSETS
Derivative financial assets	0	0
Fair Value Measurements, Recurring \| Level 1 \| Forward sale contracts - mortgage loans
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements, Recurring \| Level 1 \| US Treasury Securities
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring \| Level 1 \| Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring \| Level 1 \| Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring \| Level 1 \| Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring \| Level 1 \| Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring \| Level 1 \| Obligations of States and Political Subdivisions
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring \| Level 1 \| Marketable Equity Securities
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring \| Level 2
ASSETS
Total securities available-for-sale	713,198,000	693,487,000
Trading securities held in a Rabbi Trust	0	0
Total securities	713,198,000	693,487,000
Total Assets	719,046,000	700,683,000
LIABILITIES
Total Liabilities	5,415,000	6,985,000
Fair Value Measurements, Recurring \| Level 2 \| Interest rate swap contracts - commercial loans
ASSETS
Derivative financial assets	5,379,000	6,960,000
LIABILITIES
Derivative financial liabilities	5,352,000	6,958,000
Fair Value Measurements, Recurring \| Level 2 \| Interest rate lock commitments - mortgage loans
ASSETS
Derivative financial assets	469,000	236,000
Fair Value Measurements, Recurring \| Level 2 \| Forward sale contracts - mortgage loans
LIABILITIES
Derivative financial liabilities	63,000	27,000
Fair Value Measurements, Recurring \| Level 2 \| US Treasury Securities
ASSETS
Total securities available-for-sale	24,837,000	24,811,000
Fair Value Measurements, Recurring \| Level 2 \| Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	221,708,000	232,179,000
Fair Value Measurements, Recurring \| Level 2 \| Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	125,155,000	129,777,000
Fair Value Measurements, Recurring \| Level 2 \| Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	35,824,000	37,358,000
Fair Value Measurements, Recurring \| Level 2 \| Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	161,977,000	125,604,000
Fair Value Measurements, Recurring \| Level 2 \| Obligations of States and Political Subdivisions
ASSETS
Total securities available-for-sale	132,297,000	132,509,000
Fair Value Measurements, Recurring \| Level 2 \| Marketable Equity Securities
ASSETS
Total securities available-for-sale	11,400,000	11,249,000
Fair Value Measurements, Recurring \| Level 3
ASSETS
Total securities available-for-sale	0	0
Trading securities held in a Rabbi Trust	0	0
Total securities	0	0
Total Assets	0	0
LIABILITIES
Total Liabilities	0	0
Fair Value Measurements, Recurring \| Level 3 \| Interest rate swap contracts - commercial loans
ASSETS
Derivative financial assets	0	0
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements, Recurring \| Level 3 \| Interest rate lock commitments - mortgage loans
ASSETS
Derivative financial assets	0	0
Fair Value Measurements, Recurring \| Level 3 \| Forward sale contracts - mortgage loans
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements, Recurring \| Level 3 \| US Treasury Securities
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring \| Level 3 \| Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring \| Level 3 \| Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring \| Level 3 \| Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring \| Level 3 \| Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring \| Level 3 \| Obligations of States and Political Subdivisions
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring \| Level 3 \| Marketable Equity Securities
ASSETS
Total securities available-for-sale	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value of financial and nonfinancial obligations.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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