Acquisitions - Independence Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jan. 26, 2015	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Acquisitions
Goodwill		$ 102,085	$ 50,832	$ 51,010
IDPK
Acquisitions
Cash and cash equivalents	$ 10,486
Investment securities	56,121
Loans, gross	332,893
Allowance for loan losses	0
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
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	5,266
Bank owned life insurance	11,276
Core deposit intangible	904
Other assets	3,756
Total assets acquired	424,392
Deposits	335,685
FHLB advances	33,300
Other Liabilities	1,916
Total liabilities assumed	370,901
Excess of assets acquired over liabilities assumed	53,491
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	(472)
Bank owned life insurance	0
Core deposit intangible	1,999
Other assets	780
Total assets acquired	(1,383)
Deposits	333
FHLB advances	0
Other Liabilities	(120)
Total liabilities assumed	213
Excess of assets acquired over liabilities assumed	$ (1,596)