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, 2013	Sep. 30, 2013	Dec. 31, 2012
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	$ 36,064	$ 36,064	$ 17,873
Impaired loans without a related allowance, Unpaid Contractual Balance	52,064	52,064	76,666
Total impaired loans held to maturity, Unpaid Contractual Balance	88,128	88,128	94,539
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	35,858	35,858	17,787
Impaired loans without a related allowance, Loan Balance	45,276	45,276	65,789
Total impaired loans held to maturity, Loan Balance	81,134	81,134	83,576
Impaired loans, Related Allowance Recorded	7,141	7,141	4,624
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	34,129	24,883	24,650
Impaired loans without a related allowance, Avg. Loan Balance	47,142	53,307	64,846
Total impaired loans held to maturity, Avg. Loan Balance	81,271	78,190	89,496
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	159	461	1,277
Impaired loans without a related allowance, Interest Income Recognized	372	796	1,497
Total impaired loans held to maturity, Interest Income Recognized	531	1,257	2,774
Commercial
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	15,026	15,026	2,904
Impaired loans without a related allowance, Unpaid Contractual Balance	7,512	7,512	6,596
Total impaired loans held to maturity, Unpaid Contractual Balance	22,538	22,538	9,500
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	15,026	15,026	2,904
Impaired loans without a related allowance, Loan Balance	6,670	6,670	6,127
Total impaired loans held to maturity, Loan Balance	21,696	21,696	9,031
Impaired loans, Related Allowance Recorded	3,178	3,178	1,350
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	5,892	3,560	5,082
Impaired loans without a related allowance, Avg. Loan Balance	14,980	10,242	3,813
Total impaired loans held to maturity, Avg. Loan Balance	20,872	13,802	8,895
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	21	51	88
Impaired loans without a related allowance, Interest Income Recognized	44	56	186
Total impaired loans held to maturity, Interest Income Recognized	65	107	274
Commercial Real Estate
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	7,223	7,223	6,403
Impaired loans without a related allowance, Unpaid Contractual Balance	26,390	26,390	48,967
Total impaired loans held to maturity, Unpaid Contractual Balance	33,613	33,613	55,370
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	7,027	7,027	6,384
Impaired loans without a related allowance, Loan Balance	20,991	20,991	39,199
Total impaired loans held to maturity, Loan Balance	28,018	28,018	45,583
Impaired loans, Related Allowance Recorded	838	838	1,112
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	8,494	7,625	12,671
Impaired loans without a related allowance, Avg. Loan Balance	19,507	26,630	41,814
Total impaired loans held to maturity, Avg. Loan Balance	28,001	34,255	54,485
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	81	250	813
Impaired loans without a related allowance, Interest Income Recognized	171	284	689
Total impaired loans held to maturity, Interest Income Recognized	252	534	1,502
Commercial and Commercial Real Estate
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	22,249	22,249	9,307
Impaired loans without a related allowance, Unpaid Contractual Balance	33,902	33,902	55,563
Total impaired loans held to maturity, Unpaid Contractual Balance	56,151	56,151	64,870
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	22,053	22,053	9,288
Impaired loans without a related allowance, Loan Balance	27,661	27,661	45,326
Total impaired loans held to maturity, Loan Balance	49,714	49,714	54,614
Impaired loans, Related Allowance Recorded	4,016	4,016	2,462
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	14,386	11,185	17,753
Impaired loans without a related allowance, Avg. Loan Balance	34,487	36,872	45,627
Total impaired loans held to maturity, Avg. Loan Balance	48,873	48,057	63,380
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	102	301	901
Impaired loans without a related allowance, Interest Income Recognized	215	340	875
Total impaired loans held to maturity, Interest Income Recognized	317	641	1,776
Agricultural and Agricultural Real Estate
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	7,363	7,363	1,493
Impaired loans without a related allowance, Unpaid Contractual Balance	11,886	11,886	14,654
Total impaired loans held to maturity, Unpaid Contractual Balance	19,249	19,249	16,147
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	7,363	7,363	1,493
Impaired loans without a related allowance, Loan Balance	11,886	11,886	14,635
Total impaired loans held to maturity, Loan Balance	19,249	19,249	16,128
Impaired loans, Related Allowance Recorded	619	619	109
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	12,965	6,885	379
Impaired loans without a related allowance, Avg. Loan Balance	6,691	10,828	13,728
Total impaired loans held to maturity, Avg. Loan Balance	19,656	17,713	14,107
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	22	65	83
Impaired loans without a related allowance, Interest Income Recognized	125	370	539
Total impaired loans held to maturity, Interest Income Recognized	147	435	622
Residential Real Estate
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	2,746	2,746	3,197
Impaired loans without a related allowance, Unpaid Contractual Balance	4,782	4,782	4,741
Total impaired loans held to maturity, Unpaid Contractual Balance	7,528	7,528	7,938
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	2,736	2,736	3,170
Impaired loans without a related allowance, Loan Balance	4,250	4,250	4,273
Total impaired loans held to maturity, Loan Balance	6,986	6,986	7,443
Impaired loans, Related Allowance Recorded	678	678	783
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	3,187	3,330	2,737
Impaired loans without a related allowance, Avg. Loan Balance	4,463	4,102	3,861
Total impaired loans held to maturity, Avg. Loan Balance	7,650	7,432	6,598
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	3	13	89
Impaired loans without a related allowance, Interest Income Recognized	23	62	65
Total impaired loans held to maturity, Interest Income Recognized	26	75	154
Consumer
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	3,706	3,706	3,876
Impaired loans without a related allowance, Unpaid Contractual Balance	1,494	1,494	1,708
Total impaired loans held to maturity, Unpaid Contractual Balance	5,200	5,200	5,584
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	3,706	3,706	3,836
Impaired loans without a related allowance, Loan Balance	1,479	1,479	1,555
Total impaired loans held to maturity, Loan Balance	5,185	5,185	5,391
Impaired loans, Related Allowance Recorded	1,828	1,828	1,270
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	3,591	3,483	3,781
Impaired loans without a related allowance, Avg. Loan Balance	1,501	1,505	1,630
Total impaired loans held to maturity, Avg. Loan Balance	5,092	4,988	5,411
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	32	82	204
Impaired loans without a related allowance, Interest Income Recognized	9	24	18
Total impaired loans held to maturity, Interest Income Recognized	$ 41	$ 106	$ 222