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Investment Securities Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 236,611	$ 240,023	$ 262,455
Unrealized Gains	6,868	5,545	5,949
Unrealized Losses	(142)	(2,445)	(1,157)
Fair Value (Estimated)	243,337	243,123	267,247
U.S. Government-sponsored agencies
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	68,009	71,000	82,974
Unrealized Gains	37	40	108
Unrealized Losses	(107)	(2,284)	(912)
Fair Value (Estimated)	67,939	68,756	82,170
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	39,828	42,193	53,228
Unrealized Gains	1,675	1,305	2,030
Unrealized Losses	(35)	(136)	(116)
Fair Value (Estimated)	41,468	43,362	55,142
State and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	124,474	122,530	125,953
Unrealized Gains	5,156	4,200	3,811
Unrealized Losses	0	(25)	(129)
Fair Value (Estimated)	129,630	126,705	129,635
Corporate securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	4,300	4,300	300
Unrealized Gains	0	0	0
Unrealized Losses	0	0	0
Fair Value (Estimated)	$ 4,300	$ 4,300	$ 300

X

- Definition

Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

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+ References

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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

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-Name Accounting Standards Codification
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

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