Fair Value Measurements (Assets and Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Measured on a recurring basis:
Available for sale debt securities, at fair value	$ 1,039,304	$ 1,037,154
Equity Securities	655	658
Derivative liabilities	23
Measured on a non-recurring basis:
Foreclosed assets	7,252	6,864
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	6,999	19,005
Equity Securities	655	658
Derivative assets	0	0
Derivative liabilities	0	0
Significant Other Observable Inputs (Level 2) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	1,032,305	1,018,149
Equity Securities	0	0
Derivative assets	11,486	7,219
Derivative liabilities	9,560	6,315
Significant Unobservable Inputs (Level 3) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	0	0
Equity Securities	0	0
Derivative assets	0	0
Derivative liabilities	0	0
Agency Obligations [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	6,999	19,005
Agency Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	0	0
Agency Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	0	0
Mortgage-Backed Securities [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	1,003,603	988,367
Mortgage-Backed Securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	0	0
Mortgage-Backed Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	1,003,603	988,367
Mortgage-Backed Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	0	0
State And Municipal Obligations [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	3,330	3,388
State And Municipal Obligations [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	0	0
State And Municipal Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	3,330	3,388
State And Municipal Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	0	0
Corporate Obligations [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	25,372	26,394
Corporate Obligations [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	0	0
Corporate Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	25,372	26,394
Corporate Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	0	0
Measured on a Recurring Basis [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	1,039,304	1,037,154
Equity Securities	655	658
Derivative assets	11,486	7,219
Total assets at fair value	1,051,445	1,045,031
Derivative liabilities	9,560	6,315
Measured on a Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	6,999	19,005
Equity Securities	655	658
Derivative assets	0	0
Total assets at fair value	7,654	19,663
Derivative liabilities	0	0
Measured on a Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	1,032,305	1,018,149
Equity Securities	0	0
Derivative assets	11,486	7,219
Total assets at fair value	1,043,791	1,025,368
Derivative liabilities	9,560	6,315
Measured on a Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	0	0
Equity Securities	0	0
Derivative assets	0
Total assets at fair value	0	0
Derivative liabilities	0	0
Measured on a Recurring Basis [Member] \| Agency Obligations [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	6,999	19,005
Measured on a Recurring Basis [Member] \| Agency Obligations [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	6,999	19,005
Measured on a Recurring Basis [Member] \| Agency Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	0	0
Measured on a Recurring Basis [Member] \| Agency Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	0	0
Measured on a Recurring Basis [Member] \| Mortgage-Backed Securities [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	1,003,603	988,367
Measured on a Recurring Basis [Member] \| Mortgage-Backed Securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	0	0
Measured on a Recurring Basis [Member] \| Mortgage-Backed Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	1,003,603	988,367
Measured on a Recurring Basis [Member] \| Mortgage-Backed Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	0	0
Measured on a Recurring Basis [Member] \| State And Municipal Obligations [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	3,330	3,388
Measured on a Recurring Basis [Member] \| State And Municipal Obligations [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	0	0
Measured on a Recurring Basis [Member] \| State And Municipal Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	3,330	3,388
Measured on a Recurring Basis [Member] \| State And Municipal Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	0	0
Measured on a Recurring Basis [Member] \| Corporate Obligations [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	25,372	26,394
Measured on a Recurring Basis [Member] \| Corporate Obligations [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	0	0
Measured on a Recurring Basis [Member] \| Corporate Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	25,372	26,394
Measured on a Recurring Basis [Member] \| Corporate Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Measured on a recurring basis:
Available for sale debt securities, at fair value	0	0
Measured on a Non-Recurring Basis [Member]
Measured on a non-recurring basis:
Loans measured for impairment based on the fair value of the underlying collateral	18,689	6,971
Foreclosed assets	7,252	6,864
Fair value, Measured on a non-recurring basis	25,941	13,835
Measured on a Non-Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Measured on a non-recurring basis:
Loans measured for impairment based on the fair value of the underlying collateral	0	0
Foreclosed assets	0	0
Fair value, Measured on a non-recurring basis	0	0
Measured on a Non-Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Measured on a non-recurring basis:
Loans measured for impairment based on the fair value of the underlying collateral	0	0
Foreclosed assets	0	0
Fair value, Measured on a non-recurring basis	0	0
Measured on a Non-Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Measured on a non-recurring basis:
Loans measured for impairment based on the fair value of the underlying collateral	18,689	6,971
Foreclosed assets	7,252	6,864
Fair value, Measured on a non-recurring basis	$ 25,941	$ 13,835

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 debt 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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Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

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For an unclassified balance sheet, this item represents investments in common and preferred stocks and other forms of securities that provide ownership interests in a corporation.

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