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Securities Available-for-Sale - Composition of Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 659,629	$ 650,782
Gross Unrealized Gains	23,851	11,897
Gross Unrealized Losses	(1)	(1,716)
Fair Value	683,479	660,963
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,934	14,914
Gross Unrealized Gains	169	27
Gross Unrealized Losses		0
Fair Value	15,103	14,941
Obligations of U.S. Government Corporations and Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	256,526	262,045
Gross Unrealized Gains	5,739	1,825
Gross Unrealized Losses	0	(567)
Fair Value	262,265	263,303
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	139,532	128,458
Gross Unrealized Gains	3,730	693
Gross Unrealized Losses	0	(316)
Fair Value	143,262	128,835
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	36,396	39,185
Gross Unrealized Gains	1,618	1,091
Gross Unrealized Losses	0	(151)
Fair Value	38,014	40,125
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	79,517	69,697
Gross Unrealized Gains	2,151	183
Gross Unrealized Losses	0	(676)
Fair Value	81,668	69,204
Obligations of States and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	125,145	128,904
Gross Unrealized Gains	9,105	5,988
Gross Unrealized Losses	0	(6)
Fair Value	134,250	134,886
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	652,050	643,203
Gross Unrealized Gains	22,512	9,807
Gross Unrealized Losses	0	(1,716)
Fair Value	674,562	651,294
Marketable Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,579	7,579
Gross Unrealized Gains	1,339	2,090
Gross Unrealized Losses	(1)	0
Fair Value	$ 8,917	$ 9,669

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
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