Allowance for Loan and Lease Losses (Details 6) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Impaired Loans and Leases
Recorded investment	$ 73,585		$ 73,585		$ 51,705
Unpaid principal balance	73,542		73,542		51,686
Related Allowance	6,270		6,270		3,638
Average recorded investment	74,240	$ 60,191	67,085	$ 58,643
Interest income recognized, Total	379	333	986	956
Recorded investment in loans and leases by portfolio segment
Total, Allowance	58,892		58,892		56,739
Total Loans and Leases	5,332,300		5,332,300		4,995,540
Originated
Impaired Loans and Leases
Recorded investment, loans with no related allowance recorded	31,407		31,407		21,437
Recorded investment, loans with related allowance recorded	19,108		19,108		8,365
Recorded investment	50,515		50,515		29,802
Unpaid principal balance with no related allowance recorded	31,371		31,371		21,405
Unpaid principal balance with related allowance recorded	19,086		19,086		8,363
Unpaid principal balance	50,457		50,457		29,768
Related Allowance	5,831		5,831		3,369
Recorded investment, nonaccrual loans	29,700		29,700		9,300
Average recorded investment with no related allowance recorded	31,590	22,610	26,122	23,654
Average recorded investment with related allowance recorded	19,187	13,872	18,139	11,590
Average recorded investment	50,777	36,482	44,261	35,244
Interest income recognized with no related allowance recorded	214	207	586	584
Interest income recognized with related allowance recorded	51	51	151	156
Interest income recognized, Total	265	258	737	740
Recorded investment in loans and leases by portfolio segment
Loans and Leases Individually Evaluated for Impairment, Allowance	5,831		5,831		3,369
Loans and Leases Collectively Evaluated for Impairment, Allowance	51,421		51,421		51,618
Total, Allowance	57,252		57,252		54,987
Loans and Leases Individually Evaluated for Impairment, Portfolio	49,946		49,946		29,184
Loans and Leases Collectively Evaluated for Impairment, Portfolio	4,935,977		4,935,977		4,543,704
Total Loans and Leases	4,985,923		4,985,923		4,572,888
Acquired
Impaired Loans and Leases
Recorded investment, loans with no related allowance recorded	22,159		22,159		18,637
Recorded investment, loans with related allowance recorded	911		911		3,266
Recorded investment	23,070		23,070		21,903
Unpaid principal balance with no related allowance recorded	22,174		22,174		18,652
Unpaid principal balance with related allowance recorded	911		911		3,266
Unpaid principal balance	23,085		23,085		21,918
Related Allowance	439		439		269
Recorded investment, nonaccrual loans	4,000		4,000		7,100
Average recorded investment with no related allowance recorded	22,554	23,020	20,390	22,355
Average recorded investment with related allowance recorded	909	689	2,434	1,044
Average recorded investment	23,463	23,709	22,824	23,399
Interest income recognized with no related allowance recorded	112	74	243	210
Interest income recognized with related allowance recorded	2	1	6	6
Interest income recognized, Total	114	75	249	216
Recorded investment in loans and leases by portfolio segment
Loans and Leases Individually Evaluated for Impairment, Allowance	439		439		269
Loans and Leases Collectively Evaluated for Impairment, Allowance	319		319		449
Total, Allowance	1,640		1,640		1,752
Loans and Leases Individually Evaluated for Impairment, Portfolio	6,865		6,865		9,884
Loans and Leases Collectively Evaluated for Impairment, Portfolio	142,324		142,324		181,084
Total Loans and Leases	346,377		346,377		422,652
Acquired | Receivables Acquired with Deteriorated Credit Quality
Recorded investment in loans and leases by portfolio segment
Total, Allowance	882		882		1,034
Total Loans and Leases	197,188		197,188		231,684
Commercial real estate loans
Recorded investment in loans and leases by portfolio segment
Total, Allowance	28,056		28,056		30,151
Total Loans and Leases	2,883,428		2,883,428		2,664,394
Commercial real estate loans | Originated
Impaired Loans and Leases
Recorded investment, loans with no related allowance recorded	6,608		6,608		2,758
Recorded investment, loans with related allowance recorded	4,543		4,543		6,150
Unpaid principal balance with no related allowance recorded	6,604		6,604		2,756
Unpaid principal balance with related allowance recorded	4,542		4,542		6,150
Related Allowance	153		153		2,167
Average recorded investment with no related allowance recorded	6,636	3,077	5,655	4,403
Average recorded investment with related allowance recorded	4,549	6,172	4,957	4,791
Interest income recognized with no related allowance recorded	49	21	119	65
Interest income recognized with related allowance recorded	48	49	146	148
Recorded investment in loans and leases by portfolio segment
Loans and Leases Individually Evaluated for Impairment, Allowance	153		153		2,167
Loans and Leases Collectively Evaluated for Impairment, Allowance	26,978		26,978		26,857
Total, Allowance	27,131		27,131		29,024
Loans and Leases Individually Evaluated for Impairment, Portfolio	11,151		11,151		8,907
Loans and Leases Collectively Evaluated for Impairment, Portfolio	2,683,110		2,683,110		2,426,248
Total Loans and Leases	2,694,261		2,694,261		2,435,155
Commercial real estate loans | Acquired
Impaired Loans and Leases
Recorded investment, loans with no related allowance recorded	9,851		9,851		7,035
Recorded investment, loans with related allowance recorded	0		0		2,606
Unpaid principal balance with no related allowance recorded	9,851		9,851		7,035
Unpaid principal balance with related allowance recorded	0		0		2,606
Related Allowance	0		0		148
Average recorded investment with no related allowance recorded	9,952	10,813	8,341	9,912
Average recorded investment with related allowance recorded	0	0	1,458	81
Interest income recognized with no related allowance recorded	67	39	126	114
Interest income recognized with related allowance recorded	0	0	0	0
Recorded investment in loans and leases by portfolio segment
Loans and Leases Individually Evaluated for Impairment, Allowance	0		0		148
Loans and Leases Collectively Evaluated for Impairment, Allowance	260		260		333
Total, Allowance	925		925		1,127
Loans and Leases Individually Evaluated for Impairment, Portfolio	546		546		3,188
Loans and Leases Collectively Evaluated for Impairment, Portfolio	51,933		51,933		63,857
Total Loans and Leases	189,167		189,167		229,239
Commercial real estate loans | Acquired | Receivables Acquired with Deteriorated Credit Quality
Recorded investment in loans and leases by portfolio segment
Total, Allowance	665		665		646
Total Loans and Leases	136,688		136,688		162,194
Commercial
Recorded investment in loans and leases by portfolio segment
Total, Allowance	26,464		26,464		22,018
Total Loans and Leases	1,470,866		1,470,866		1,374,296
Commercial | Originated
Impaired Loans and Leases
Recorded investment, loans with no related allowance recorded	21,338		21,338		14,097
Recorded investment, loans with related allowance recorded	14,317		14,317		2,215
Unpaid principal balance with no related allowance recorded	21,311		21,311		14,074
Unpaid principal balance with related allowance recorded	14,298		14,298		2,213
Related Allowance	5,580		5,580		1,202
Average recorded investment with no related allowance recorded	21,474	15,112	16,602	15,095
Average recorded investment with related allowance recorded	14,390	7,700	13,017	6,687
Interest income recognized with no related allowance recorded	147	171	412	474
Interest income recognized with related allowance recorded	3	2	5	8
Recorded investment in loans and leases by portfolio segment
Loans and Leases Individually Evaluated for Impairment, Allowance	5,580		5,580		1,202
Loans and Leases Collectively Evaluated for Impairment, Allowance	20,365		20,365		20,545
Total, Allowance	25,945		25,945		21,747
Loans and Leases Individually Evaluated for Impairment, Portfolio	35,185		35,185		15,806
Loans and Leases Collectively Evaluated for Impairment, Portfolio	1,413,462		1,413,462		1,333,656
Total Loans and Leases	1,448,647		1,448,647		1,349,462
Commercial | Acquired
Impaired Loans and Leases
Recorded investment, loans with no related allowance recorded	3,886		3,886		4,053
Recorded investment, loans with related allowance recorded	486		486		486
Unpaid principal balance with no related allowance recorded	3,886		3,886		4,052
Unpaid principal balance with related allowance recorded	486		486		486
Related Allowance	410		410		112
Average recorded investment with no related allowance recorded	4,127	4,113	4,254	4,516
Average recorded investment with related allowance recorded	486	596	486	689
Interest income recognized with no related allowance recorded	29	16	66	48
Interest income recognized with related allowance recorded	0	0	0	0
Recorded investment in loans and leases by portfolio segment
Loans and Leases Individually Evaluated for Impairment, Allowance	410		410		112
Loans and Leases Collectively Evaluated for Impairment, Allowance	19		19		71
Total, Allowance	519		519		271
Loans and Leases Individually Evaluated for Impairment, Portfolio	3,454		3,454		4,090
Loans and Leases Collectively Evaluated for Impairment, Portfolio	11,860		11,860		12,081
Total Loans and Leases	22,219		22,219		24,834
Commercial | Acquired | Receivables Acquired with Deteriorated Credit Quality
Recorded investment in loans and leases by portfolio segment
Total, Allowance	90		90		88
Total Loans and Leases	6,905		6,905		8,663
Consumer loans
Recorded investment in loans and leases by portfolio segment
Total, Allowance	4,222		4,222		4,301
Total Loans and Leases	970,399		970,399		943,172
Consumer loans | Originated
Impaired Loans and Leases
Recorded investment, loans with no related allowance recorded	3,461		3,461		4,582
Recorded investment, loans with related allowance recorded	248		248		0
Unpaid principal balance with no related allowance recorded	3,456		3,456		4,575
Unpaid principal balance with related allowance recorded	246		246		0
Related Allowance	98		98		0
Average recorded investment with no related allowance recorded	3,480	4,421	3,865	4,156
Average recorded investment with related allowance recorded	248	0	165	112
Interest income recognized with no related allowance recorded	18	15	55	45
Interest income recognized with related allowance recorded	0	0	0	0
Recorded investment in loans and leases by portfolio segment
Loans and Leases Individually Evaluated for Impairment, Allowance	98		98		0
Loans and Leases Collectively Evaluated for Impairment, Allowance	3,928		3,928		3,947
Total, Allowance	4,026		4,026		3,947
Loans and Leases Individually Evaluated for Impairment, Portfolio	3,610		3,610		4,471
Loans and Leases Collectively Evaluated for Impairment, Portfolio	831,798		831,798		770,122
Total Loans and Leases	835,408		835,408		774,593
Consumer loans | Acquired
Impaired Loans and Leases
Recorded investment, loans with no related allowance recorded	8,422		8,422		7,549
Recorded investment, loans with related allowance recorded	425		425		174
Unpaid principal balance with no related allowance recorded	8,437		8,437		7,565
Unpaid principal balance with related allowance recorded	425		425		174
Related Allowance	29		29		9
Average recorded investment with no related allowance recorded	8,475	8,094	7,795	7,927
Average recorded investment with related allowance recorded	423	93	490	274
Interest income recognized with no related allowance recorded	16	19	51	48
Interest income recognized with related allowance recorded	2	$ 1	6	$ 6
Recorded investment in loans and leases by portfolio segment
Loans and Leases Individually Evaluated for Impairment, Allowance	29		29		9
Loans and Leases Collectively Evaluated for Impairment, Allowance	40		40		45
Total, Allowance	196		196		354
Loans and Leases Individually Evaluated for Impairment, Portfolio	2,865		2,865		2,606
Loans and Leases Collectively Evaluated for Impairment, Portfolio	78,531		78,531		105,146
Total Loans and Leases	134,991		134,991		168,579
Consumer loans | Acquired | Receivables Acquired with Deteriorated Credit Quality
Recorded investment in loans and leases by portfolio segment
Total, Allowance	127		127		300
Total Loans and Leases	53,595		53,595		60,827
Indirect automobile loans
Recorded investment in loans and leases by portfolio segment
Total, Allowance	150		150		269
Total Loans and Leases	7,607		7,607		13,678
Indirect automobile loans | Originated
Recorded investment in loans and leases by portfolio segment
Loans and Leases Individually Evaluated for Impairment, Allowance	0		0		0
Loans and Leases Collectively Evaluated for Impairment, Allowance	150		150		269
Total, Allowance	150		150		269
Loans and Leases Individually Evaluated for Impairment, Portfolio	0		0		0
Loans and Leases Collectively Evaluated for Impairment, Portfolio	7,607		7,607		13,678
Total Loans and Leases	7,607		7,607		13,678
Indirect automobile loans | Acquired
Recorded investment in loans and leases by portfolio segment
Loans and Leases Individually Evaluated for Impairment, Allowance	0		0		0
Loans and Leases Collectively Evaluated for Impairment, Allowance	0		0		0
Total, Allowance	0		0		0
Loans and Leases Individually Evaluated for Impairment, Portfolio	0		0		0
Loans and Leases Collectively Evaluated for Impairment, Portfolio	0		0		0
Total Loans and Leases	0		0		0
Indirect automobile loans | Acquired | Receivables Acquired with Deteriorated Credit Quality
Recorded investment in loans and leases by portfolio segment
Total, Allowance	0		0		0
Total Loans and Leases	$ 0		$ 0		$ 0