Loans - Impaired Loans Individually Evaluated (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
With an allowance recorded
Related allowance	$ 7,774	$ 1,775
Recorded investment	72,462	93,324
Unpaid principal balance	72,771	93,867
Commercial & Industrial
With an allowance recorded
Related allowance	7,415	1,654
Recorded investment	59,367	71,082
Unpaid principal balance	59,630	71,576
Real Estate Portfolio Segment
With an allowance recorded
Related allowance	327
Recorded investment	12,811	22,023
Unpaid principal balance	12,862	22,071
Consumer and other
With an allowance recorded
Related allowance	32	121
Recorded investment	284	219
Unpaid principal balance	279	220
Originated
With no related allowance recorded
Recorded investment	20,275	41,920
Unpaid principal balance	20,465	42,178
With an allowance recorded
Recorded investment	26,249	3,111
Unpaid principal balance	26,322	3,157
Related allowance	7,752	513
Recorded investment	46,524	45,031
Unpaid principal balance	46,787	45,335
Originated | Commercial & Industrial
With no related allowance recorded
Recorded investment	18,372	33,415
Unpaid principal balance	18,557	33,671
With an allowance recorded
Recorded investment	23,233	2,992
Unpaid principal balance	23,306	3,038
Related allowance	7,415	394
Originated | Commercial real estate
With no related allowance recorded
Recorded investment	202	7,155
Unpaid principal balance	202	7,162
Originated | Construction, land & land development
With no related allowance recorded
Recorded investment	174
Unpaid principal balance	178
With an allowance recorded
Recorded investment	2,964
Unpaid principal balance	2,964
Related allowance	308
Originated | Residential mortgage
With no related allowance recorded
Recorded investment	1,507	1,254
Unpaid principal balance	1,507	1,249
Originated | Consumer and other
With no related allowance recorded
Recorded investment	20	96
Unpaid principal balance	21	96
With an allowance recorded
Recorded investment	52	119
Unpaid principal balance	52	119
Related allowance	29	119
Acquired
With no related allowance recorded
Recorded investment	25,916	46,538
Unpaid principal balance	25,962	46,755
With an allowance recorded
Recorded investment	22	1,755
Unpaid principal balance	22	1,777
Related allowance	22	1,262
Recorded investment	25,938	48,293
Unpaid principal balance	25,984	48,532
Acquired | Commercial & Industrial
With no related allowance recorded
Recorded investment	17,762	32,922
Unpaid principal balance	17,767	33,093
With an allowance recorded
Recorded investment		1,753
Unpaid principal balance		1,774
Related allowance		1,260
Acquired | Owner occupied commercial real estate
With no related allowance recorded
Recorded investment	6,880
Unpaid principal balance	6,914
With an allowance recorded
Recorded investment		8,942
Unpaid principal balance		8,949
Acquired | Commercial real estate
With no related allowance recorded
Recorded investment	127	2,002
Unpaid principal balance	127	2,026
Acquired | Construction, land & land development
With no related allowance recorded
Recorded investment	920
Unpaid principal balance	933
With an allowance recorded
Recorded investment		978
Unpaid principal balance		991
Acquired | Residential mortgage
With no related allowance recorded
Recorded investment	18	1,692
Unpaid principal balance	18	1,694
With an allowance recorded
Recorded investment	19
Unpaid principal balance	19
Related allowance	19
Acquired | Consumer and other
With no related allowance recorded
Recorded investment	209	2
Unpaid principal balance	203	2
With an allowance recorded
Recorded investment	3	2
Unpaid principal balance	3	3
Related allowance	$ 3	$ 2