Fair Value (Details 4) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Carrying amount and estimated fair value of financial instruments
Fair value	$ 8,143	$ 9,725
Securities available-for-sale	884,176	891,082
Restricted Investments	10,838	10,838
Accrued interest receivable	11,907	11,733
Deposits	(2,400,655)	(2,442,369)
Fair Value, Inputs, Level 1 [Member]
Carrying amount and estimated fair value of financial instruments
Cash and Cash Equivalents, Fair Value Disclosure	22,316	19,715
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure	0	0
Securities available-for-sale	0	0
Loans Receivable, Fair Value Disclosure	0	0
FDIC Indemnification Asset		0
Accrued interest receivable	0	0
Deposits	0	0
Short-term borrowings	0	0
Federal Home Loan Bank advances	0	0
Accrued interest payable	0	0
Fair Value, Inputs, Level 2 [Member]
Carrying amount and estimated fair value of financial instruments
Cash and Cash Equivalents, Fair Value Disclosure	43,809	68,980
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure	6,444	9,815
Securities available-for-sale	866,814	871,482
Loans Receivable, Fair Value Disclosure	0	0
FDIC Indemnification Asset		0
Accrued interest receivable	3,801	3,366
Deposits	(2,401,845)	(2,442,612)
Short-term borrowings	(31,116)	(33,831)
Federal Home Loan Bank advances	(12,466)	(12,971)
Accrued interest payable	(362)	(389)
Fair Value, Inputs, Level 3 [Member]
Carrying amount and estimated fair value of financial instruments
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure	0	0
Securities available-for-sale	17,362	19,600
Loans Receivable, Fair Value Disclosure	1,805,697	1,789,938
FDIC Indemnification Asset		0
Accrued interest receivable	8,106	8,367
Deposits	0	0
Short-term borrowings	0	0
Federal Home Loan Bank advances	0	0
Accrued interest payable	0	0
Reported Value Measurement [Member]
Carrying amount and estimated fair value of financial instruments
Cash and Cash Equivalents, Fair Value Disclosure	66,125	88,695
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure	6,444	9,815
Securities available-for-sale	884,176	891,082
Restricted Investments	10,838	10,838
Loans Receivable, Fair Value Disclosure	1,743,733	1,743,862
FDIC Indemnification Asset		0
Accrued interest receivable	11,907	11,733
Deposits	(2,400,655)	(2,442,369)
Short-term borrowings	(31,116)	(33,831)
Federal Home Loan Bank advances	(12,252)	(12,677)
Accrued interest payable	(362)	(389)
Estimate of Fair Value Measurement [Member]
Carrying amount and estimated fair value of financial instruments
Cash and Cash Equivalents, Fair Value Disclosure	66,125	88,695
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure	6,444	9,815
Securities available-for-sale	884,176	891,082
Loans Receivable, Fair Value Disclosure	1,805,697	1,789,938
FDIC Indemnification Asset		0
Accrued interest receivable	11,907	11,733
Deposits	(2,401,845)	(2,442,612)
Short-term borrowings	(31,116)	(33,831)
Federal Home Loan Bank advances	(12,466)	(12,971)
Accrued interest payable	$ (362)	$ (389)

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Fair value portion of federal funds sold and securities borrowed or purchased under agreements to resell.

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
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Amount of interest payable on debt, including, but not limited to, trade payables.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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