Business Combinations (Loans Acquired) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Jan. 13, 2017	Mar. 11, 2016
Business Acquisition [Line Items]
PCI loans and leases	$ 85,149	$ 85,149	$ 35,416
Commercial
Business Acquisition [Line Items]
PCI loans and leases	54,976
Commercial | Construction and land development
Business Acquisition [Line Items]
PCI loans and leases	7,061
Commercial | Mortgage
Business Acquisition [Line Items]
PCI loans and leases	21,836
Commercial | Other commercial real estate
Business Acquisition [Line Items]
PCI loans and leases	6,404
Commercial | Commercial and industrial
Business Acquisition [Line Items]
PCI loans and leases	19,675
Noncommercial
Business Acquisition [Line Items]
PCI loans and leases	30,173
Noncommercial | Mortgage
Business Acquisition [Line Items]
PCI loans and leases	25,857
Noncommercial | Consumer
Business Acquisition [Line Items]
PCI loans and leases	$ 882