Loans (Schedule of Acquired Impaired Loans, Accretable Yield and Carrying Amount) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Covered impaired loan
Accretable Yield
Balance at beginning of period	$ 22,908	$ 37,511
Accretion	(2,297)	(5,567)
Net reclassifications from nonaccretable to accretable	1,673	(56)
Disposals	(158)	(2,021)
Balance at end of period	22,126	29,867
Carrying Amount of Loans
Balance at beginning of period	130,648	232,452
Accretion	2,297	5,567
Payments received, net	(10,811)	(38,794)
Balance at end of period	122,134	199,225
Acquired Impaired Loans
Accretable Yield
Balance at beginning of period	89,823	119,450
Accretion	(8,902)	(11,218)
Net reclassifications from nonaccretable to accretable	7,753	12,995
Disposals	(3,230)	(2,471)
Balance at end of period	85,444	118,756
Carrying Amount of Loans
Balance at beginning of period	284,709	423,209
Accretion	8,902	11,218
Payments received, net	(36,459)	(46,114)
Balance at end of period	$ 257,152	$ 388,313