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Revenue Recognition - Summary of Noninterest Income Segregated By Revenue Streams In-scope and Out-of-scope of Topic 606 (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Noninterest income
Noninterest Income (in-scope of Topic 606)	$ 2,917	$ 2,723	$ 11,437	$ 10,795
Noninterest Income (out-of-scope of Topic 606)	371	742	1,856	1,909
Total Noninterest Income	3,288	3,465	13,293	12,704
Service Charges [Member]
Noninterest income
Noninterest Income (in-scope of Topic 606)	1,219	1,177	3,712	3,609
ATM/Interchange Fees [Member]
Noninterest income
Noninterest Income (in-scope of Topic 606)	622	567	1,764	1,643
Wealth Management Fees [Member]
Noninterest income
Noninterest Income (in-scope of Topic 606)	873	787	2,561	2,233
Tax Refund Processing Fees [Member]
Noninterest income
Noninterest Income (in-scope of Topic 606)			2,750	2,750
Other [Member]
Noninterest income
Noninterest Income (in-scope of Topic 606)	$ 203	$ 192	$ 650	$ 560

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Noninterest income out Oo scope of Topic 606.

+ References

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The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13)
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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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