Fair Value (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Assets
Loans held for sale	$ 48,985	$ 57,683	$ 61,934
Securities available for sale	885,798	805,114	806,766
Government-sponsored entities debt
Assets
Securities available for sale	123,794	137,459	148,197
State and municipal obligations
Assets
Securities available for sale	134,338	141,258	137,581
Corporate Stocks
Assets
Securities available for sale	2,593	3,388	3,042
Significant Other Observable Inputs (Level 2)
Assets
Loans held for sale	48,985	57,683	61,934
Significant Unobservable Inputs (Level 3)
Assets
Mortgage servicing rights	24,665	22,052	21,601
Liabilities
Changes in hierarchy classifications of Level 3 liabilities	0
Recurring basis
Assets
Derivative financial instruments	2,379	1,101	2,148
Loans held for sale	48,985	57,683	61,934
Securities available for sale	885,798	805,114	806,766
Mortgage servicing rights	24,665	22,052	21,601
Fair value of Assets, Total	961,827	885,950	892,449
Liabilities
Derivative financial instruments	1,904	986	1,341
Recurring basis \| Government-sponsored entities debt
Assets
Securities available for sale	123,794	137,459	148,197
Recurring basis \| State and municipal obligations
Assets
Securities available for sale	134,338	141,258	137,581
Recurring basis \| Mortgage-backed securities
Assets
Securities available for sale	625,073	523,009	517,946
Recurring basis \| Corporate Stocks
Assets
Securities available for sale	2,593	3,388	3,667
Recurring basis \| Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	2,368	3,163	2,817
Fair value of Assets, Total	2,368	3,163	2,817
Recurring basis \| Quoted Prices In Active Markets for Identical Assets (Level 1) \| Corporate Stocks
Assets
Securities available for sale	2,368	3,163	3,442
Recurring basis \| Significant Other Observable Inputs (Level 2)
Assets
Derivative financial instruments	2,379	1,101	2,148
Loans held for sale	48,985	57,683	61,934
Securities available for sale	883,430	801,951	803,949
Fair value of Assets, Total	934,794	860,735	868,031
Liabilities
Derivative financial instruments	1,904	986	1,341
Recurring basis \| Significant Other Observable Inputs (Level 2) \| Government-sponsored entities debt
Assets
Securities available for sale	123,794	137,459	148,197
Recurring basis \| Significant Other Observable Inputs (Level 2) \| State and municipal obligations
Assets
Securities available for sale	134,338	141,258	137,581
Recurring basis \| Significant Other Observable Inputs (Level 2) \| Mortgage-backed securities
Assets
Securities available for sale	625,073	523,009	517,946
Recurring basis \| Significant Other Observable Inputs (Level 2) \| Corporate Stocks
Assets
Securities available for sale	225	225	225
Recurring basis \| Significant Unobservable Inputs (Level 3)
Assets
Mortgage servicing rights	24,665	22,052	21,601
Fair value of Assets, Total	24,665	22,052	$ 21,601
Changes in fair value of assets
Fair value of assets at the beginning of the period	21,601	20,729
Servicing assets that resulted from transfers of financial assets	(5,770)	(3,575)
Changes in fair value assets due to valuation inputs or assumptions	(92)	(529)
Changes in fair value assets due to increased principal paydowns	2,614	1,723
Fair value of assets at the end of the period	24,665	22,052
Unrealized losses included in accumulated other comprehensive income related to Level 3 financial assets and liabilities	$ 0	$ 0

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Amount of servicing assets resulting from transfers of financial instruments classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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The element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, the element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. The item represents residential mortgage servicing rights as presented on the statement of financial position which are due to the entity as of the balance sheet date.

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Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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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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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy.

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Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

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Amount, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

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