Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Purchase of common stock, shares	0	700,000	600,000	649,449	627,652	0
Dividends declared per share	$ 0.09	$ 3.84	$ 0.09	$ 0.09	$ 0.09	$ 0.07
Equity compensation activity, shares	9,712	6,901	46,129	12,267	4,935	44,980

Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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