Loans and Allowance for Loan Losses - Summary of non acquired loans - (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loans and Allowance for Loan Losses
Loans, net	$ 6,643,326,000	$ 5,970,044,000
Deferred fees	341,000	1,200,000
Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	5,241,041,000	4,220,726,000	$ 3,467,826,000
Less allowance for non-acquired loan losses	(36,960,000)	(34,090,000)	(34,539,000)	$ (34,331,000)
Loans, net	5,204,081,000	4,186,636,000
Commercial non-owner occupied real estate \| Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	1,295,179,000	889,756,000
Commercial non-owner occupied real estate \| Construction and land development \| Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	580,464,000	401,979,000	364,221,000
Less allowance for non-acquired loan losses	(4,091,000)	(4,116,000)	(5,666,000)	(6,789,000)
Commercial non-owner occupied real estate \| Other commercial non-owner occupied real estate \| Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	714,715,000	487,777,000	333,590,000
Less allowance for non-acquired loan losses	(4,980,000)	(3,568,000)	(3,154,000)	(3,677,000)
Consumer real estate \| Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	1,580,839,000	1,338,239,000
Consumer real estate \| Home equity loans \| Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	383,218,000	319,255,000	283,934,000
Less allowance for non-acquired loan losses	(3,211,000)	(2,929,000)	(2,829,000)	(2,782,000)
Commercial and industrial \| Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	671,398,000	503,808,000	405,923,000
Less allowance for non-acquired loan losses	(4,842,000)	(3,974,000)	(3,561,000)	(3,592,000)
Other income producing property \| Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	178,238,000	175,848,000	150,928,000
Less allowance for non-acquired loan losses	(1,542,000)	(1,963,000)	(2,232,000)	(2,509,000)
Consumer \| Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	324,238,000	233,104,000	189,317,000
Less allowance for non-acquired loan losses	$ (2,350,000)	$ (1,694,000)	$ (1,367,000)	$ (937,000)

The amount of deferred fees, net of deferred costs as of the reporting period.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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