Loans - Impaired Loans Individually Evaluated (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
With an allowance recorded
Related allowance	$ 11,584		$ 11,584		$ 14,840
Recorded investment	98,830		98,830		44,993
Unpaid principal balance	99,218		99,218		45,051
Average Recorded Investment	99,679	$ 14,510	71,269	$ 10,391	16,700
Interest income recognized	382	39	757	324
Commercial & Industrial [Member]
With an allowance recorded
Related allowance	11,449		11,449		14,733
Recorded investment	82,205		82,205		35,083
Unpaid principal balance	82,563		82,563		35,123
Real Estate Portfolio Segment [Member]
With an allowance recorded
Related allowance	14		14		107
Recorded investment	16,392		16,392		9,736
Unpaid principal balance	16,422		16,422		9,754
Consumer and other [Member]
With an allowance recorded
Related allowance	121		121
Recorded investment	233		233		174
Unpaid principal balance	233		233		174
Originated [Member]
With no related allowance recorded
Recorded investment	24,488		24,488		8,708
Unpaid principal balance	24,545		24,545		8,714
With an allowance recorded
Recorded investment	41,580		41,580		32,689
Unpaid principal balance	41,815		41,815		32,729
Related allowance	8,898		8,898		14,839
Recorded investment	66,068		66,068		41,397
Unpaid principal balance	66,360		66,360		41,443
Average Recorded Investment	71,777	12,457	58,760	9,073
Interest income recognized	192	36	566	313
Originated [Member] | Commercial & Industrial [Member]
With no related allowance recorded
Recorded investment	15,106		15,106		1,898
Unpaid principal balance	15,151		15,151		1,899
With an allowance recorded
Recorded investment	41,447		41,447		32,471
Unpaid principal balance	41,682		41,682		32,510
Related allowance	8,765		8,765		14,733
Average Recorded Investment	62,932	8,878	51,141	5,151
Interest income recognized	38	5	57	24
Originated [Member] | Owner occupied commercial real estate [Member]
With no related allowance recorded
Recorded investment	1,454		1,454		829
Unpaid principal balance	1,464		1,464		834
With an allowance recorded
Average Recorded Investment	1,498	1,059	1,030	1,173
Interest income recognized	73	20	73	20
Originated [Member] | Commercial real estate [Member]
With no related allowance recorded
Recorded investment	7,261		7,261		5,356
Unpaid principal balance	7,267		7,267		5,356
With an allowance recorded
Average Recorded Investment	6,589	1,806	5,718	1,246
Interest income recognized	80	9	241	13
Originated [Member] | Construction, land & land development [Member]
With no related allowance recorded
Recorded investment					268
Unpaid principal balance					268
With an allowance recorded
Recorded investment					204
Unpaid principal balance					204
Related allowance					92
Average Recorded Investment		492	205	598
Interest income recognized			180	15
Originated [Member] | Residential mortgage [Member]
With no related allowance recorded
Recorded investment	565		565		183
Unpaid principal balance	561		561		183
With an allowance recorded
Recorded investment	14		14		14
Unpaid principal balance	14		14		15
Related allowance	14		14		14
Average Recorded Investment	575	76	531	735
Interest income recognized			10	233
Originated [Member] | Consumer and other [Member]
With no related allowance recorded
Recorded investment	102		102		174
Unpaid principal balance	102		102		174
With an allowance recorded
Recorded investment	119		119
Unpaid principal balance	119		119
Related allowance	119		119
Average Recorded Investment	183	146	135	170
Interest income recognized	1	2	5	8
Acquired [Member]
With no related allowance recorded
Recorded investment	16,298		16,298		3,544
Unpaid principal balance	16,321		16,321		3,556
With an allowance recorded
Recorded investment	16,464		16,464		52
Unpaid principal balance	16,537		16,537		52
Related allowance	2,686		2,686		1
Recorded investment	32,762		32,762		3,596
Unpaid principal balance	32,858		32,858		3,608
Average Recorded Investment	27,902	2,053	12,509	1,318
Interest income recognized	190	3	191	11
Acquired [Member] | Commercial & Industrial [Member]
With no related allowance recorded
Recorded investment	9,190		9,190		714
Unpaid principal balance	9,195		9,195		714
With an allowance recorded
Recorded investment	16,462		16,462
Unpaid principal balance	16,535		16,535
Related allowance	2,684		2,684
Average Recorded Investment	20,362	677	7,372	354
Interest income recognized	63	3	63	4
Acquired [Member] | Owner occupied commercial real estate [Member]
With no related allowance recorded
Recorded investment	2,583		2,583
Unpaid principal balance	2,587		2,587
With an allowance recorded
Average Recorded Investment	3,029		1,431
Acquired [Member] | Commercial real estate [Member]
With no related allowance recorded
Recorded investment	2,623		2,623		1,590
Unpaid principal balance	2,646		2,646		1,607
With an allowance recorded
Average Recorded Investment	2,304	899	1,932	663
Interest income recognized	48		48
Acquired [Member] | Construction, land & land development [Member]
With no related allowance recorded
Recorded investment	358		358
Unpaid principal balance	358		358
With an allowance recorded
Average Recorded Investment	239		79
Acquired [Member] | Residential mortgage [Member]
With no related allowance recorded
Recorded investment	1,534		1,534		1,240
Unpaid principal balance	1,525		1,525		1,235
With an allowance recorded
Recorded investment					52
Unpaid principal balance					52
Related allowance					$ 1
Average Recorded Investment	1,959	$ 477	1,691	300
Interest income recognized	79		80	7
Acquired [Member] | Consumer and other [Member]
With no related allowance recorded
Recorded investment	10		10
Unpaid principal balance	10		10
With an allowance recorded
Recorded investment	2		2
Unpaid principal balance	2		2
Related allowance	2		2
Average Recorded Investment	$ 9		$ 4	$ 1