Acquisitions (Details) - USD ($)					12 Months Ended
		Jun. 30, 2016	Sep. 01, 2015	Jul. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Period for merger dates					1 year
Decrease in deferred tax asset						$ 1,900,000
Allocation of total consideration paid [Abstract]
Goodwill					$ 551,593,796	$ 432,232,255
CapitalMark Bank & Trust [Member]
Business Acquisition [Line Items]
Fractional shares of common stock (in shares)				0.50
Stock consideration percentage				90.00%
Cash consideration percentage				10.00%
Average closing price for common stock (in dollars per share)				$ 26.78
Valuation in shares (in shares)				3,300,000
Valuation in dollars				$ 19,700,000
Period for average closing price					10 days
Equity consideration [Abstract]
Total equity consideration, Amount				205,955,000
Fair value of stock options assumed				30,430,000
Non-equity consideration [Abstract]
Cash				19,675,000
Total consideration paid				225,630,000
Allocation of total consideration paid [Abstract]
Fair value of net assets assumed including estimated identifiable intangible assets				73,186,000
Goodwill				152,444,000
Assets [Abstract]
Cash and cash equivalents				28,021,000
Investment securities	[1]			150,400,000
Loans	[2]			857,515,000
Mortgage loans held for sale				1,791,000
Other real estate owned				1,728,000
Core deposit intangible	[3]			6,193,000
Other assets	[4]			49,572,000
Total Assets				1,095,220,000
Liabilities [Abstract]
Interest-bearing deposits	[5]			759,383,000
Non-interest bearing deposits				193,798,000
Borrowings	[6]			33,102,000
Other liabilities				35,751,000
Total Liabilities				1,022,034,000
Fair value of net assets assumed including estimated identifiable intangible assets				73,186,000
CapitalMark Bank & Trust [Member] | Historical Cost Basis [Member]
Allocation of total consideration paid [Abstract]
Fair value of net assets assumed including estimated identifiable intangible assets				85,065,000
Assets [Abstract]
Cash and cash equivalents				28,021,000
Investment securities	[1]			150,799,000
Loans	[2]			880,115,000
Mortgage loans held for sale				1,791,000
Other real estate owned				1,728,000
Core deposit intangible	[3]			0
Other assets	[4]			43,526,000
Total Assets				1,105,980,000
Liabilities [Abstract]
Interest-bearing deposits	[5]			758,492,000
Non-interest bearing deposits				193,798,000
Borrowings	[6]			32,874,000
Other liabilities				35,751,000
Total Liabilities				1,020,915,000
Fair value of net assets assumed including estimated identifiable intangible assets				85,065,000
CapitalMark Bank & Trust [Member] | Fair Value Adjustments [Member]
Allocation of total consideration paid [Abstract]
Fair value of net assets assumed including estimated identifiable intangible assets				(11,879,000)
Assets [Abstract]
Cash and cash equivalents				0
Investment securities	[1]			(399,000)
Loans	[2]			(22,600,000)
Mortgage loans held for sale				0
Other real estate owned				0
Core deposit intangible	[3]			6,193,000
Other assets	[4]			6,046,000
Total Assets				(10,760,000)
Liabilities [Abstract]
Interest-bearing deposits	[5]			891,000
Non-interest bearing deposits				0
Borrowings	[6]			228,000
Other liabilities				0
Total Liabilities				1,119,000
Fair value of net assets assumed including estimated identifiable intangible assets				$ (11,879,000)
CapitalMark Bank & Trust [Member] | Common Stock [Member]
Equity consideration [Abstract]
Total equity consideration, Number of Shares (in shares)				3,306,184
Total equity consideration, Amount				$ 175,525,000
Magna Bank [Member]
Business Acquisition [Line Items]
Fractional shares of common stock (in shares)			0.3369
Stock consideration percentage			75.00%
Cash consideration percentage			25.00%
Business acquisition share price in cash (in dollars per share)			$ 14.32
Unexercised stock options exchanged for cash (in shares)			139,417
Unexercised stock options exchange price less than exercise price (in dollars per share)			$ 14.32
Valuation in shares (in shares)			1,400,000
Valuation in dollars			$ 19,500,000
Equity consideration [Abstract]
Total equity consideration, Amount			63,538,000
Non-equity consideration [Abstract]
Cash			19,453,000
Cash paid to exchange outstanding stock options			847,000
Total consideration paid			83,838,000
Allocation of total consideration paid [Abstract]
Fair value of net assets assumed including estimated identifiable intangible assets			49,050,000
Goodwill			34,788,000
Assets [Abstract]
Cash and cash equivalents			17,832,000
Investment securities	[7]		59,738,000
Loans	[8]		440,679,000
Mortgage loans held for sale			18,886,000
Other real estate owned	[9]		1,610,000
Core deposit intangible	[3]		3,170,000
Other assets	[10]		35,979,000
Total Assets			577,894,000
Liabilities [Abstract]
Interest-bearing deposits	[11]		403,803,000
Non-interest bearing deposits			48,851,000
Borrowings	[12]		47,406,000
Other liabilities	[13]		28,784,000
Total Liabilities			528,844,000
Fair value of net assets assumed including estimated identifiable intangible assets			49,050,000
Magna Bank [Member] | Historical Cost Basis [Member]
Allocation of total consideration paid [Abstract]
Fair value of net assets assumed including estimated identifiable intangible assets			56,043,000
Assets [Abstract]
Cash and cash equivalents			17,832,000
Investment securities	[7]		60,018,000
Loans	[8]		453,108,000
Mortgage loans held for sale			18,886,000
Other real estate owned	[9]		1,471,000
Core deposit intangible	[3]		0
Other assets	[10]		31,057,000
Total Assets			582,372,000
Liabilities [Abstract]
Interest-bearing deposits	[11]		402,535,000
Non-interest bearing deposits			48,851,000
Borrowings	[12]		46,900,000
Other liabilities	[13]		28,043,000
Total Liabilities			526,329,000
Fair value of net assets assumed including estimated identifiable intangible assets			56,043,000
Magna Bank [Member] | Fair Value Adjustments [Member]
Allocation of total consideration paid [Abstract]
Fair value of net assets assumed including estimated identifiable intangible assets			(6,993,000)
Assets [Abstract]
Cash and cash equivalents			0
Investment securities	[7]		(280,000)
Loans	[8]		(12,429,000)
Mortgage loans held for sale			0
Other real estate owned	[9]		139,000
Core deposit intangible	[3]		3,170,000
Other assets	[10]		4,922,000
Total Assets			(4,478,000)
Liabilities [Abstract]
Interest-bearing deposits	[11]		1,268,000
Non-interest bearing deposits			0
Borrowings	[12]		506,000
Other liabilities	[13]		741,000
Total Liabilities			2,515,000
Fair value of net assets assumed including estimated identifiable intangible assets			$ (6,993,000)
Magna Bank [Member] | Common Stock [Member]
Equity consideration [Abstract]
Total equity consideration, Number of Shares (in shares)			1,371,717
Total equity consideration, Amount			$ 63,538,000
Avenue Financial Holdings, Inc. (Avenue) [Member]
Equity consideration [Abstract]
Total equity consideration, Amount		$ 182,469,000
Non-equity consideration [Abstract]
Cash		20,910,000
Cash paid to exchange outstanding stock options		987,000
Total consideration paid		204,366,000
Allocation of total consideration paid [Abstract]
Fair value of net assets assumed including estimated identifiable intangible assets		81,695,000
Goodwill		122,671,000
Assets [Abstract]
Cash and cash equivalents		39,485,000
Investment securities	[14]	163,399,000
Loans	[15]	952,530,000
Mortgage loans held for sale		3,310,000
Core deposit intangible	[3]	8,845,000
Other assets	[16]	56,503,000
Total Assets		1,224,072,000
Liabilities [Abstract]
Interest-bearing deposits	[17]	743,035,000
Non-interest bearing deposits		223,685,000
Borrowings	[18]	145,879,000
Other liabilities		29,778,000
Total Liabilities		1,142,377,000
Fair value of net assets assumed including estimated identifiable intangible assets		81,695,000
Avenue Financial Holdings, Inc. (Avenue) [Member] | Historical Cost Basis [Member]
Allocation of total consideration paid [Abstract]
Fair value of net assets assumed including estimated identifiable intangible assets		97,027,000
Assets [Abstract]
Cash and cash equivalents		39,485,000
Investment securities	[14]	163,862,000
Loans	[15]	980,319,000
Mortgage loans held for sale		3,310,000
Core deposit intangible	[3]	0
Other assets	[16]	47,729,000
Total Assets		1,234,705,000
Liabilities [Abstract]
Interest-bearing deposits	[17]	741,635,000
Non-interest bearing deposits		223,685,000
Borrowings	[18]	142,639,000
Other liabilities		29,719,000
Total Liabilities		1,137,678,000
Fair value of net assets assumed including estimated identifiable intangible assets		97,027,000
Avenue Financial Holdings, Inc. (Avenue) [Member] | Fair Value Adjustments [Member]
Allocation of total consideration paid [Abstract]
Fair value of net assets assumed including estimated identifiable intangible assets		(15,332,000)
Assets [Abstract]
Cash and cash equivalents		0
Investment securities	[14]	(463,000)
Loans	[15]	(27,789,000)
Mortgage loans held for sale		0
Core deposit intangible	[3]	8,845,000
Other assets	[16]	8,774,000
Total Assets		(10,633,000)
Liabilities [Abstract]
Interest-bearing deposits	[17]	1,400,000
Non-interest bearing deposits		0
Borrowings	[18]	3,240,000
Other liabilities		59,000
Total Liabilities		4,699,000
Fair value of net assets assumed including estimated identifiable intangible assets		$ (15,332,000)
Avenue Financial Holdings, Inc. (Avenue) [Member] | Common Stock [Member]
Equity consideration [Abstract]
Total equity consideration, Number of Shares (in shares)		3,760,326
Total equity consideration, Amount		$ 182,469,000

[1] The amount represents the adjustment of the book value of CapitalMark's investment securities to their estimated fair value on the date of acquisition.

[2] The amount represents the adjustment of the net book value of CapitalMark's loans to their estimated fair value based on current interest rates and expected cash flows as of the date of acquisition, which includes estimates of expected credit losses inherent in the portfolio.

[3] The amount represents the fair value of the core deposit intangible asset representing the intangible value of the deposit base acquired.

[4] The amount represents the deferred tax asset recognized on the fair value adjustment of CapitalMark's acquired assets and assumed liabilities as well as the fair value adjustment on premises and equipment.

[5] The amount represents the adjustment is necessary because the weighted average interest rate of CapitalMark's deposits exceeded the cost of similar funding at the time of acquisition. The fair value adjustment will be amortized to reduce future interest expense over the life of the portfolio.

[6] The amount represents the adjustment necessary because the weighted average interest rate of CapitalMark's FHLB advances exceeded the cost of similar funding at the time of acquisition. The fair value adjustment will be amortized to reduce future interest expense over the life of the portfolio.

[7] The amount represents the adjustment of the book value of Magna's investment securities to their estimated fair value on the date of acquisition.

[8] The amount represents the adjustment of the net book value of Magna's loans to their estimated fair value based on interest rates and expected cash flows as of the date of acquisition, which includes estimates of expected credit losses inherent in the portfolio.

[9] The amount represents the adjustment to the book value of Magna's OREO to fair value on the date of acquisition.

[10] The amount represents the deferred tax asset recognized on the fair value adjustment of Magna's acquired assets and assumed liabilities as well as the fair value adjustment for the mortgage servicing right and property and equipment. The value of the deferred tax asset was decreased by $1.9 million as a result of the completion of the 2015 tax return.

[11] The amount represents the adjustment necessary because the weighted average interest rate of Magna's deposits exceeded the cost of similar funding at the time of acquisition. The fair value adjustment will be amortized to reduce future interest expense over the life of the portfolio.

[12] The amount represents the adjustment necessary because the weighted average interest rate of Magna's FHLB advances exceeded the cost of similar funding at the time of acquisition. The fair value adjustment will be amortized to reduce future interest expense over the life of the portfolio.

[13] The amount represents the adjustment to accrue two potential loss contingencies related to Magna's business operations that existed as of the date of acquisition.

[14] The amount represents the adjustment of the book value of Avenue's investment securities to their estimated fair value on the date of acquisition.

[15] The amount represents the adjustment of the net book value of Avenue's loans to their estimated fair value based on interest rates and expected cash flows as of the date of acquisition, which includes estimates of expected credit losses inherent in the portfolio.

[16] The amount represents the deferred tax asset recognized on the fair value adjustment of Avenue's acquired assets and assumed liabilities as well as the fair value adjustment for property and equipment.

[17] The amount represents the adjustment necessary because the weighted average interest rate of Avenue's deposits exceeded the cost of similar funding at the time of acquisition. The fair value adjustment will be amortized to reduce future interest expense over the life of the portfolio.

[18] The amount represents the adjustment necessary because the weighted average interest rate of Avenue's FHLB advances and subordinated debt issuance exceeded the cost of similar funding at the time of acquisition. The fair value adjustment will be amortized to reduce future interest expense over the life of the portfolio.