Loans and Leases (Impaired loans not covered by loss share agreements) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Unpaid Contractual Balance
Total impaired loans with a related allowance	$ 25,858	$ 25,858	$ 9,210
Total impaired loans without a related allowance	79,038	79,038	74,644
Total impaired loans held to maturity	104,896	104,896	83,854
Loan Balance
Total impaired loans with a related allowance	25,772	25,772	9,093
Total impaired loans without a related allowance	77,471	77,471	71,128
Total impaired loans held to maturity	103,243	103,243	80,221
Related Allowance Recorded	5,925	5,925	2,768
Average Loan Balance
Total impaired loans with a related allowance	18,167	15,316	11,287
Total impaired loans without a related allowance	77,055	80,544	60,831
Total impaired loans held to maturity	95,222	95,860	72,118
Interest Income Recognized
Total impaired loans with a related allowance	225	249	80
Total impaired loans without a related allowance	531	1,241	2,268
Total impaired loans held to maturity	756	1,490	2,348
Commercial
Unpaid Contractual Balance
Total impaired loans with a related allowance	2,664	2,664	1,192
Total impaired loans without a related allowance	5,332	5,332	5,784
Total impaired loans held to maturity	7,996	7,996	6,976
Loan Balance
Total impaired loans with a related allowance	2,664	2,664	1,160
Total impaired loans without a related allowance	5,321	5,321	5,759
Total impaired loans held to maturity	7,985	7,985	6,919
Related Allowance Recorded	1,342	1,342	471
Average Loan Balance
Total impaired loans with a related allowance	3,598	2,857	524
Total impaired loans without a related allowance	4,709	7,281	7,511
Total impaired loans held to maturity	8,307	10,138	8,035
Interest Income Recognized
Total impaired loans with a related allowance	8	14	12
Total impaired loans without a related allowance	91	261	515
Total impaired loans held to maturity	99	275	527
Commercial real estate
Unpaid Contractual Balance
Total impaired loans with a related allowance	16,106	16,106	2,697
Total impaired loans without a related allowance	38,783	38,783	46,099
Total impaired loans held to maturity	54,889	54,889	48,796
Loan Balance
Total impaired loans with a related allowance	16,106	16,106	2,697
Total impaired loans without a related allowance	37,375	37,375	42,745
Total impaired loans held to maturity	53,481	53,481	45,442
Related Allowance Recorded	2,780	2,780	698
Average Loan Balance
Total impaired loans with a related allowance	7,823	6,037	2,539
Total impaired loans without a related allowance	38,928	42,830	38,444
Total impaired loans held to maturity	46,751	48,867	40,983
Interest Income Recognized
Total impaired loans with a related allowance	208	213	19
Total impaired loans without a related allowance	380	785	1,395
Total impaired loans held to maturity	588	998	1,414
Commercial and commercial real estate
Unpaid Contractual Balance
Total impaired loans with a related allowance	18,770	18,770	3,889
Total impaired loans without a related allowance	44,115	44,115	51,883
Total impaired loans held to maturity	62,885	62,885	55,772
Loan Balance
Total impaired loans with a related allowance	18,770	18,770	3,857
Total impaired loans without a related allowance	42,696	42,696	48,504
Total impaired loans held to maturity	61,466	61,466	52,361
Related Allowance Recorded	4,122	4,122	1,169
Average Loan Balance
Total impaired loans with a related allowance	11,421	8,894	3,063
Total impaired loans without a related allowance	43,637	50,111	45,955
Total impaired loans held to maturity	55,058	59,005	49,018
Interest Income Recognized
Total impaired loans with a related allowance	216	227	31
Total impaired loans without a related allowance	471	1,046	1,910
Total impaired loans held to maturity	687	1,273	1,941
Agricultural and agricultural real estate
Unpaid Contractual Balance
Total impaired loans with a related allowance	111	111	0
Total impaired loans without a related allowance	14,248	14,248	4,612
Total impaired loans held to maturity	14,359	14,359	4,612
Loan Balance
Total impaired loans with a related allowance	111	111	0
Total impaired loans without a related allowance	14,248	14,248	4,612
Total impaired loans held to maturity	14,359	14,359	4,612
Related Allowance Recorded	6	6	0
Average Loan Balance
Total impaired loans with a related allowance	36	18	2,823
Total impaired loans without a related allowance	14,031	10,700	2,287
Total impaired loans held to maturity	14,067	10,718	5,110
Interest Income Recognized
Total impaired loans with a related allowance	0	0	0
Total impaired loans without a related allowance	0	94	175
Total impaired loans held to maturity	0	94	175
Residential real estate
Unpaid Contractual Balance
Total impaired loans with a related allowance	3,792	3,792	2,210
Total impaired loans without a related allowance	18,137	18,137	15,802
Total impaired loans held to maturity	21,929	21,929	18,012
Loan Balance
Total impaired loans with a related allowance	3,706	3,706	2,125
Total impaired loans without a related allowance	18,004	18,004	15,665
Total impaired loans held to maturity	21,710	21,710	17,790
Related Allowance Recorded	446	446	393
Average Loan Balance
Total impaired loans with a related allowance	3,351	3,127	2,524
Total impaired loans without a related allowance	17,050	17,082	10,186
Total impaired loans held to maturity	20,401	20,209	12,710
Interest Income Recognized
Total impaired loans with a related allowance	3	7	16
Total impaired loans without a related allowance	49	81	145
Total impaired loans held to maturity	52	88	161
Consumer
Unpaid Contractual Balance
Total impaired loans with a related allowance	3,185	3,185	3,111
Total impaired loans without a related allowance	2,538	2,538	2,347
Total impaired loans held to maturity	5,723	5,723	5,458
Loan Balance
Total impaired loans with a related allowance	3,185	3,185	3,111
Total impaired loans without a related allowance	2,523	2,523	2,347
Total impaired loans held to maturity	5,708	5,708	5,458
Related Allowance Recorded	1,351	1,351	1,206
Average Loan Balance
Total impaired loans with a related allowance	3,359	3,277	2,877
Total impaired loans without a related allowance	2,337	2,651	2,403
Total impaired loans held to maturity	5,696	5,928	5,280
Interest Income Recognized
Total impaired loans with a related allowance	6	15	33
Total impaired loans without a related allowance	11	20	38
Total impaired loans held to maturity	$ 17	$ 35	$ 71