Loans and Leases (Impaired loans not covered by loss share agreements) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	$ 18,574	$ 18,574	$ 36,828
Impaired loans without a related allowance, Unpaid Contractual Balance	50,033	50,033	42,400
Total impaired loans held to maturity, Unpaid Contractual Balance	68,607	68,607	79,228
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	18,144	18,144	36,573
Impaired loans without a related allowance, Loan Balance	43,440	43,440	35,388
Total impaired loans held to maturity, Loan Balance	61,584	61,584	71,961
Impaired loans, Related Allowance Recorded	3,405	3,405	6,717
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	34,423	25,806	27,235
Impaired loans without a related allowance, Avg. Loan Balance	36,733	38,352	50,768
Total impaired loans held to maturity, Avg. Loan Balance	71,156	64,158	78,003
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	48	215	787
Impaired loans without a related allowance, Interest Income Recognized	635	1,051	933
Total impaired loans held to maturity, Interest Income Recognized	683	1,266	1,720
Commercial
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	4,751	4,751	7,901
Impaired loans without a related allowance, Unpaid Contractual Balance	4,222	4,222	7,724
Total impaired loans held to maturity, Unpaid Contractual Balance	8,973	8,973	15,625
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	4,675	4,675	7,901
Impaired loans without a related allowance, Loan Balance	3,603	3,603	6,743
Total impaired loans held to maturity, Loan Balance	8,278	8,278	14,644
Impaired loans, Related Allowance Recorded	451	451	2,817
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	6,960	7,022	5,343
Impaired loans without a related allowance, Avg. Loan Balance	2,620	3,519	9,394
Total impaired loans held to maturity, Avg. Loan Balance	9,580	10,541	14,737
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	0	10	38
Impaired loans without a related allowance, Interest Income Recognized	20	60	89
Total impaired loans held to maturity, Interest Income Recognized	20	70	127
Commercial real estate
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	4,092	4,092	9,164
Impaired loans without a related allowance, Unpaid Contractual Balance	33,626	33,626	24,830
Total impaired loans held to maturity, Unpaid Contractual Balance	37,718	37,718	33,994
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	3,832	3,832	8,909
Impaired loans without a related allowance, Loan Balance	29,448	29,448	19,390
Total impaired loans held to maturity, Loan Balance	33,280	33,280	28,299
Impaired loans, Related Allowance Recorded	1,176	1,176	818
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	11,645	6,294	7,686
Impaired loans without a related allowance, Avg. Loan Balance	23,937	23,325	25,676
Total impaired loans held to maturity, Avg. Loan Balance	35,582	29,619	33,362
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	7	40	282
Impaired loans without a related allowance, Interest Income Recognized	595	883	538
Total impaired loans held to maturity, Interest Income Recognized	602	923	820
Commercial and Commercial Real Estate
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	8,843	8,843	17,065
Impaired loans without a related allowance, Unpaid Contractual Balance	37,848	37,848	32,554
Total impaired loans held to maturity, Unpaid Contractual Balance	46,691	46,691	49,619
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	8,507	8,507	16,810
Impaired loans without a related allowance, Loan Balance	33,051	33,051	26,133
Total impaired loans held to maturity, Loan Balance	41,558	41,558	42,943
Impaired loans, Related Allowance Recorded	1,627	1,627	3,635
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	18,605	13,316	13,029
Impaired loans without a related allowance, Avg. Loan Balance	26,557	26,844	35,070
Total impaired loans held to maturity, Avg. Loan Balance	45,162	40,160	48,099
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	7	50	320
Impaired loans without a related allowance, Interest Income Recognized	615	943	627
Total impaired loans held to maturity, Interest Income Recognized	622	993	947
Agricultural and agricultural real estate
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	3,368	3,368	13,818
Impaired loans without a related allowance, Unpaid Contractual Balance	3,749	3,749	2,849
Total impaired loans held to maturity, Unpaid Contractual Balance	7,117	7,117	16,667
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	3,368	3,368	13,818
Impaired loans without a related allowance, Loan Balance	2,321	2,321	2,849
Total impaired loans held to maturity, Loan Balance	5,689	5,689	16,667
Impaired loans, Related Allowance Recorded	67	67	756
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	4,021	4,176	7,537
Impaired loans without a related allowance, Avg. Loan Balance	2,100	3,731	9,985
Total impaired loans held to maturity, Avg. Loan Balance	6,121	7,907	17,522
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	12	67	354
Impaired loans without a related allowance, Interest Income Recognized	3	10	189
Total impaired loans held to maturity, Interest Income Recognized	15	77	543
Residential real estate
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	2,024	2,024	2,460
Impaired loans without a related allowance, Unpaid Contractual Balance	6,616	6,616	5,345
Total impaired loans held to maturity, Unpaid Contractual Balance	8,640	8,640	7,805
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	1,939	1,939	2,460
Impaired loans without a related allowance, Loan Balance	6,248	6,248	4,754
Total impaired loans held to maturity, Loan Balance	8,187	8,187	7,214
Impaired loans, Related Allowance Recorded	424	424	605
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	6,308	3,604	3,179
Impaired loans without a related allowance, Avg. Loan Balance	6,449	6,055	4,198
Total impaired loans held to maturity, Avg. Loan Balance	12,757	9,659	7,377
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	8	17	13
Impaired loans without a related allowance, Interest Income Recognized	0	64	80
Total impaired loans held to maturity, Interest Income Recognized	8	81	93
Consumer
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	4,339	4,339	3,485
Impaired loans without a related allowance, Unpaid Contractual Balance	1,820	1,820	1,652
Total impaired loans held to maturity, Unpaid Contractual Balance	6,159	6,159	5,137
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	4,330	4,330	3,485
Impaired loans without a related allowance, Loan Balance	1,820	1,820	1,652
Total impaired loans held to maturity, Loan Balance	6,150	6,150	5,137
Impaired loans, Related Allowance Recorded	1,287	1,287	1,721
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	5,489	4,710	3,490
Impaired loans without a related allowance, Avg. Loan Balance	1,627	1,722	1,515
Total impaired loans held to maturity, Avg. Loan Balance	7,116	6,432	5,005
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	21	81	100
Impaired loans without a related allowance, Interest Income Recognized	17	34	37
Total impaired loans held to maturity, Interest Income Recognized	$ 38	$ 115	$ 137