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Dividends and Share Repurchases	3 Months Ended
	Dec. 31, 2017
Dividends [Abstract]
Dividends and Share Repurchases	Dividends and Share Repurchases On November 20, 2017, the Company paid a regular dividend on common stock of $0.15 per share, which represented the 139th consecutive quarterly cash dividend. Dividends per share were $0.15 and $0.14 for the quarters ended December 31, 2017 and 2016, respectively. On January 24, 2018, the Company declared a regular dividend on common stock of $0.17 per share, which represents its 140th consecutive quarterly cash dividend. This dividend will be paid on February 23, 2018 to common shareholders of record on February 9, 2018. For the three months ended December 31, 2017, the Company repurchased 1,147,370 shares at an average price of $33.98. Additionally, 108,704 shares of common stock were issued during the three months ended December 31, 2017 to investors that exercised warrants previously issued as part of the 2008 Troubled Asset Relief Program ("TARP"). As of December 31, 2017, 112,649 such warrants remain outstanding. Net of warrant cash repurchase activity, there are 753,585 remaining shares authorized to be repurchased under the current Board approved share repurchase program. On January 24, 2018, the Board approved an additional 5,000,000 shares available under the repurchase program.

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The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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