Business Combinations (Loans Acquired) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 01, 2016	Mar. 11, 2016	Feb. 13, 2015
Business Acquisition [Line Items]
Contractually required payments		$ 296,529
Non-PCI Loans		241,392
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	$ 80,690		$ 80,690	$ 154,496
Commercial
Business Acquisition [Line Items]
Non-PCI Loans		134,468
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	58,934
Commercial | Construction and land development
Business Acquisition [Line Items]
Non-PCI Loans		3,066
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	684
Commercial | Mortgage
Business Acquisition [Line Items]
Non-PCI Loans		77,455
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	50,372
Commercial | Other commercial real estate
Business Acquisition [Line Items]
Non-PCI Loans		22,174
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	2,629
Commercial | Commercial and industrial
Business Acquisition [Line Items]
Non-PCI Loans		31,773
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	3,630
Noncommercial
Business Acquisition [Line Items]
Non-PCI Loans		106,924
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	21,756
Noncommercial | Construction and land development
Business Acquisition [Line Items]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	340
Noncommercial | Mortgage
Business Acquisition [Line Items]
Non-PCI Loans		16,839
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	18,934
Noncommercial | Consumer
Business Acquisition [Line Items]
Non-PCI Loans		$ 80,218
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	$ 1,244