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Mergers and Acquisitions (Unaudited Pro Forma Information) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									6 Months Ended		12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Net interest income after loan loss provision	$ 9,310	$ 8,579	$ 8,173	$ 8,138	$ 8,075	$ 7,970	$ 7,924	$ 8,186	$ 6,738	$ 18,360	$ 16,213	$ 32,975	$ 30,818	$ 24,583
Noninterest Income	1,362	1,875	1,419	1,398	1,232	960	1,085	1,093	949	2,798	2,630	5,924	4,113	3,284
Noninterest expense	$ 7,558	$ 7,740	$ 7,165	$ 6,921	$ 6,982	$ 6,882	$ 6,569	$ 6,642	$ 6,640	$ 15,360	$ 13,903	$ 28,818	26,759	20,704
Phoenix Bancorp Inc. [Member]
Business Acquisition [Line Items]
Net interest income after loan loss provision													31,454	29,745
Noninterest Income													4,152	4,131
Noninterest expense													27,817	26,846
Net income available to common shareholders													$ 5,811	$ 5,259
Net income per common share													$ 1.38	$ 1.25

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.12)
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Total aggregate amount of all noninterest expense.

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-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
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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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-SubTopic 225
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