Consolidated statements of changes in shareholders' equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016
Statement Of Stockholders Equity [Abstract]
Cash dividends paid, per share		$ 0.54
Fair Value Election on Mortgage Servicing Rights Retained Earnings Adjustment, Tax	$ 396

Aggregate dividends paid during the period for each share of common stock outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Balance Type:	na
Period Type:	duration