Loans and the Allowance for Loan Losses - (Details 10) $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)
Certain Loans Acquired In Transfer Accounted For As Debt Securities Accretable Yield Movement Schedule Roll Forward
Balance at January 1, 2015	$ (32,433)
Reclasses from nonaccretable difference	(1,014)
Accretion	8,668
Chargeoff	1,469
Balance at June 30, 2015	(23,310)
Impaired Covered Loans
Certain Loans Acquired In Transfer Accounted For As Debt Securities Accretable Yield Movement Schedule Roll Forward
Balance at January 1, 2015	(1)
Reclasses from nonaccretable difference	(45)
Accretion	40
Balance at June 30, 2015	(6)
Other Covered Loans
Certain Loans Acquired In Transfer Accounted For As Debt Securities Accretable Yield Movement Schedule Roll Forward
Balance at January 1, 2015	(2,623)
Reclasses from nonaccretable difference	(1,144)
Accretion	3,070
Balance at June 30, 2015	(697)
Not Covered Loans
Certain Loans Acquired In Transfer Accounted For As Debt Securities Accretable Yield Movement Schedule Roll Forward
Balance at January 1, 2015	(29,809)
Reclasses from nonaccretable difference	175
Accretion	5,558
Chargeoff	1,469
Balance at June 30, 2015	$ (22,607)