Loans and Allowance for Loan Losses, Impaired Financing Receivable (Details) - USD ($)		3 Months Ended		12 Months Ended
		Mar. 31, 2016		Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Recorded investment		$ 42,524,000		$ 29,359,000
Unpaid principal balance		47,035,000	[1]	34,441,000
Related allowance	[2]	2,274,000		3,669,000
Average recorded investment		43,740,000		21,613,000
Interest income recognized		31,350.00		308,000
Interest income from cash payments received		31,000		308,000
Collateral Dependent Impaired Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment		30,511,000		18,958,000
Unpaid principal balance		34,594,000	[1]	22,935,000
Related allowance	[2]	0		0
Average recorded investment		31,473,000		11,164,000
Interest income recognized		31,350.00		308,000
Collateral Dependent Impaired Loans [Member] | Commercial Real Estate - Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment		3,826,000		4,411,000
Unpaid principal balance		4,491,000	[1]	5,659,000
Related allowance	[2]	0		0
Average recorded investment		3,854,000		2,253,000
Interest income recognized		0		0
Collateral Dependent Impaired Loans [Member] | Consumer Real Estate - Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment		4,431,000		5,596,000
Unpaid principal balance		4,916,000	[1]	6,242,000
Related allowance	[2]	0		0
Average recorded investment		4,462,000		3,067,000
Interest income recognized		0		0
Collateral Dependent Impaired Loans [Member] | Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment		7,122,000		7,531,000
Unpaid principal balance		7,526,000	[1]	7,883,000
Related allowance	[2]	0		0
Average recorded investment		7,320,000		4,317,000
Interest income recognized		31,350.00		308,000
Collateral Dependent Impaired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment		14,747,000		1,420,000
Unpaid principal balance		17,252,000	[1]	3,151,000
Related allowance	[2]	0		0
Average recorded investment		15,451,000		1,527,000
Interest income recognized		0		0
Collateral Dependent Impaired Loans [Member] | Consumer and Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment		385,000		0
Unpaid principal balance		409,000	[1]	0
Related allowance	[2]	0		0
Average recorded investment		386,000		0
Interest income recognized		0		0
Cash Flow Dependent Impaired Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment		12,013,000		10,401,000
Unpaid principal balance		12,441,000	[1]	11,506,000
Related allowance	[2]	2,274,000		3,669,000
Average recorded investment		12,267,000		10,449,000
Interest income recognized		0		0
Cash Flow Dependent Impaired Loans [Member] | Commercial Real Estate - Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment		1,532,000		1,410,000
Unpaid principal balance		1,536,000	[1]	1,661,000
Related allowance	[2]	197,000		20,000
Average recorded investment		1,548,000		1,466,000
Interest income recognized		0		0
Cash Flow Dependent Impaired Loans [Member] | Consumer Real Estate - Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment		5,749,000		3,750,000
Unpaid principal balance		5,665,000	[1]	4,098,000
Related allowance	[2]	529,000		616,000
Average recorded investment		5,815,000		3,815,000
Interest income recognized		0		0
Cash Flow Dependent Impaired Loans [Member] | Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment		71,000		76,000
Unpaid principal balance		68,000	[1]	125,000
Related allowance	[2]	256,000		12,000
Average recorded investment		74,000		87,000
Interest income recognized		0		0
Cash Flow Dependent Impaired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment		1,304,000		263,000
Unpaid principal balance		1,294,000	[1]	281,000
Related allowance	[2]	1,056,000		19,000
Average recorded investment		1,128,000		168,000
Interest income recognized		0		0
Cash Flow Dependent Impaired Loans [Member] | Consumer and Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment		3,357,000		4,902,000
Unpaid principal balance		3,878,000	[1]	5,341,000
Related allowance	[2]	236,000		3,002,000
Average recorded investment		3,702,000		4,913,000
Interest income recognized		$ 0		$ 0

[1] Unpaid principal balance presented net of fair value adjustments recorded in conjunction with purchase accounting.

[2] Collateral dependent loans are typically charged-off to their net realizable value and no specific allowance is carried related to those loans.