Business Combinations Business Combinations (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended			9 Months Ended
	Sep. 02, 2016	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 01, 2016	May 06, 2016	Mar. 11, 2016	Dec. 31, 2015	Feb. 13, 2015
Business Acquisition [Line Items]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value		$ 80,690			$ 80,690				$ 80,690		$ 154,496
Non-PCI Loans							$ 241,392
Gain on acquisition		837		$ 0	5,831	$ 42,930
Merger-related expenses		3,764		$ 3,679	5,187	$ 11,249
Goodwill		150,601			150,601					$ 139,773
North Milwaukee State Bank
Business Acquisition [Line Items]
Cash and cash equivalents									4,545
Overnight investments									2,274
Investment securities available for sale									9,425
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value									36,914
Intangible asset									240
Other assets									216
Total assets acquired									53,614
Deposits									59,206
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments Related to Previous Period			$ 1,200
Short-term borrowings									1,662
Other liabilities									74
Total liabilities assumed									60,942
Fair value of net assets (liabilities) assumed									(7,328)
Cash received from FDIC									$ 10,200
Gain on acquisition					2,872
Merger-related expenses		35			511
Revenue generated		699			1,498
First CornerStone Bank
Business Acquisition [Line Items]
Cash and cash equivalents								$ 748
Overnight investments								37,540
Investment securities available for sale								4,564
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value								43,776
Other real estate owned								375
Business Combination Assets and Liabilities Acquired Income Earned Not Collected								8
Intangible asset								390
Other assets								13
Total assets acquired								87,414
Deposits								96,882
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments Related to Previous Period		837
Other liabilities								23
Total liabilities assumed								96,905
Fair value of net assets (liabilities) assumed								(9,491)
Cash received from FDIC								$ 12,450
Gain on acquisition					2,959
Merger-related expenses		130			923
Revenue generated		573			897
Cordia Bancorp Inc.
Business Acquisition [Line Items]
Business Acquisition, Share Price							$ 5.15
Business Combination, Consideration Transferred	$ 37,053
Cash and cash equivalents							$ 8,383
Overnight investments							3,081
Investment securities available for sale							76,633
Non-PCI Loans							241,392
Premises and equipment							4,151
Other real estate owned							1,170
Business Combination Assets and Liabilities Acquired Income Earned Not Collected							1,990
Intangible asset							2,210
Other assets							10,318
Total assets acquired							349,328
Deposits							292,192
Short-term borrowings							30,164
Other liabilities							747
Total liabilities assumed							323,103
Fair value of net assets (liabilities) assumed							26,225
Merger-related expenses		3,599			$ 3,753
Revenue generated		$ 1,032
Goodwill							$ 10,828