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Fair Value of Financial Instruments and Fair Value Measurements (Details 1) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets:
Estimated fair value	$ 353,438	$ 348,931
Derivative financial instruments	797	260
Common stocks [Member]
Assets:
Estimated fair value	1,486	1,283
Fair Value, Measurements, Recurring [Member]
Assets:
Derivative financial instruments	797	260
Fair Value, Measurements, Recurring [Member] | Common stocks [Member]
Assets:
Estimated fair value	1,486	1,283
Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member]
Assets:
Estimated fair value	85,985	135,519
U. S. federal agency obligations [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	29,920	25,743
Municipal obligations, tax exempt [Member]
Assets:
Estimated fair value	137,941	110,509
Municipal obligations, tax exempt [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	137,941	110,509
Municipal obligations, taxable [Member]
Assets:
Estimated fair value	81,890	63,922
Municipal obligations, taxable [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	81,890	63,922
U. S. treasury securities [Member]
Assets:
Estimated fair value	6,517	6,530
U. S. treasury securities [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	6,517	6,530
Certificates of deposit [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	9,699	5,425
Fair Value, Inputs, Level 1 [Member]
Assets:
Estimated fair value	8,003	7,813
Derivative financial instruments	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Derivative financial instruments	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Common stocks [Member]
Assets:
Estimated fair value	1,486	1,283
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member]
Assets:
Estimated fair value	0	0
Fair Value, Inputs, Level 1 [Member] | U. S. federal agency obligations [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	0	0
Fair Value, Inputs, Level 1 [Member] | Municipal obligations, tax exempt [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	0	0
Fair Value, Inputs, Level 1 [Member] | Municipal obligations, taxable [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	0	0
Fair Value, Inputs, Level 1 [Member] | U. S. treasury securities [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	6,517	6,530
Fair Value, Inputs, Level 1 [Member] | Certificates of deposit [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	0	0
Fair Value, Inputs, Level 2 [Member]
Assets:
Estimated fair value	345,435	341,118
Derivative financial instruments	797	260
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Derivative financial instruments	797	260
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Common stocks [Member]
Assets:
Estimated fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member]
Assets:
Estimated fair value	85,985	135,519
Fair Value, Inputs, Level 2 [Member] | U. S. federal agency obligations [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	29,920	25,743
Fair Value, Inputs, Level 2 [Member] | Municipal obligations, tax exempt [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	137,941	110,509
Fair Value, Inputs, Level 2 [Member] | Municipal obligations, taxable [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	81,890	63,922
Fair Value, Inputs, Level 2 [Member] | U. S. treasury securities [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	0	0
Fair Value, Inputs, Level 2 [Member] | Certificates of deposit [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	9,699	5,425
Fair Value, Inputs, Level 3 [Member]
Assets:
Estimated fair value	0	0
Derivative financial instruments	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Derivative financial instruments	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Common stocks [Member]
Assets:
Estimated fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member]
Assets:
Estimated fair value	0	0
Fair Value, Inputs, Level 3 [Member] | U. S. federal agency obligations [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Municipal obligations, tax exempt [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Municipal obligations, taxable [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	0	0
Fair Value, Inputs, Level 3 [Member] | U. S. treasury securities [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Certificates of deposit [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Estimated fair value	$ 0	$ 0

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

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