Loans (Schedule of Acquired Impaired Loans, Accretable Yield and Carrying Amount) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Covered impaired loan
Accretable Yield
Balance at beginning of period	$ 22,126	$ 29,867	$ 22,908	$ 37,511
Accretion	(2,231)	(4,100)	(4,528)	(9,667)
Net reclassifications from nonaccretable to accretable	699	2,136	2,372	2,080
Disposals	(371)	(1,753)	(529)	(3,774)
Balance at end of period	20,223	26,150	20,223	26,150
Carrying Amount of Loans
Balance at beginning of period	122,134	199,225	130,648	232,452
Accretion	2,231	4,100	4,528	9,667
Payments received, net	(5,604)	(45,517)	(16,415)	(84,311)
Balance at end of period	118,761	157,808	118,761	157,808
Acquired Impaired Loans
Accretable Yield
Balance at beginning of period	85,444	118,756	89,823	119,450
Accretion	(7,921)	(10,285)	(16,823)	(21,503)
Net reclassifications from nonaccretable to accretable	4,883	8,217	12,636	21,212
Disposals	(3,042)	(4,657)	(6,272)	(7,128)
Balance at end of period	79,364	112,031	79,364	112,031
Carrying Amount of Loans
Balance at beginning of period	257,152	388,313	284,709	423,209
Accretion	7,921	10,285	16,823	21,503
Payments received, net	(25,878)	(42,434)	(62,337)	(88,548)
Balance at end of period	$ 239,195	$ 356,164	$ 239,195	$ 356,164