Acquisitions Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands			9 Months Ended
	Jan. 26, 2015	Jan. 30, 2014	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Acquisitions
Deferred loan costs		$ 0
Allowance for loan losses	$ 0	0
Consideration paid			$ 118,900
Goodwill			$ 50,832	$ 22,950	$ 22,950
IDPK
Acquisitions
Cash and cash equivalents	10,486
Investment securities	56,121
Loans, gross	332,893
Deferred income taxes	4,794
Bank owned life insurance	11,276
Core deposit intangible	2,903
Other assets	4,536
Total assets acquired	423,009
Deposits	336,018
FHLB advances	33,300
Other liabilities	1,796
Total liabilities assumed	371,114
Excess of assets acquired over liabilities assumed	51,895
Consideration paid	79,777
Goodwill	27,882
Infinity Franchise Holdings Acquisition
Acquisitions
Cash and cash equivalents		555
Loans, gross		78,833
Other assets		776
Total assets acquired		80,164
Bank loan		67,617
Accrued compensation		495
Other liabilities		214
Total liabilities assumed		68,326
Excess of assets acquired over liabilities assumed		11,838
Consideration paid		17,360
Goodwill		5,522
IFH Book Value | IDPK
Acquisitions
Cash and cash equivalents	10,486
Investment securities	56,503
Loans, gross	339,502
Allowance for loan losses	(3,301)
Deferred income taxes	3,252
Bank owned life insurance	11,276
Core deposit intangible	904
Other assets	3,756
Total assets acquired	422,378
Deposits	335,685
FHLB advances	33,300
Other liabilities	1,916
Total liabilities assumed	370,901
Excess of assets acquired over liabilities assumed	51,477
IFH Book Value | Infinity Franchise Holdings Acquisition
Acquisitions
Cash and cash equivalents		555
Loans, gross		78,833
Deferred loan costs		1,082
Allowance for loan losses		(268)
Other assets		776
Total assets acquired		80,978
Bank loan		67,617
Accrued compensation		495
Other liabilities		214
Total liabilities assumed		68,326
Excess of assets acquired over liabilities assumed		12,652
Fair Value Adjustments | IDPK
Acquisitions
Cash and cash equivalents	0
Investment securities	(382)
Loans, gross	(6,609)
Allowance for loan losses	3,301
Deferred income taxes	1,542
Bank owned life insurance	0
Core deposit intangible	1,999
Other assets	780
Total assets acquired	631
Deposits	333
FHLB advances	0
Other liabilities	(120)
Total liabilities assumed	213
Excess of assets acquired over liabilities assumed	$ 418
Fair Value Adjustments | Infinity Franchise Holdings Acquisition
Acquisitions
Cash and cash equivalents		0
Loans, gross		0
Deferred loan costs		(1,082)
Allowance for loan losses		268
Other assets		0
Total assets acquired		(814)
Bank loan		0
Accrued compensation		0
Other liabilities		0
Total liabilities assumed		0
Excess of assets acquired over liabilities assumed		$ (814)