Stockholders' Equity and Earnings per Common Share, OCI by Component, Anti-Dilutive Securities (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			$ (5,893)	$ (10,802)
Net change for quarter	$ 862	$ 596	262	4,339
Balance at end of period	(5,631)	(6,463)	(5,631)	(6,463)
Unrealized Gains (Losses) on Securities [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			(78)	(5,317)
Net change for quarter			(209)	3,928
Balance at end of period	(287)	(1,389)	(287)	(1,389)
Unrealized Losses on Securities Transferred to Held to Maturity [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			(3,386)	(3,937)
Net change for quarter			471	411
Balance at end of period	(2,915)	(3,526)	(2,915)	(3,526)
Defined Benefit Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			(2,429)	(1,548)
Net change for quarter			0	0
Balance at end of period	$ (2,429)	$ (1,548)	$ (2,429)	$ (1,548)
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	76	84	77	134