Loans and Leases (Impaired loans not covered by loss share agreements) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2014	Dec. 31, 2013
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	$ 12,674	$ 36,828
Impaired loans without a related allowance, Unpaid Contractual Balance	54,588	42,400
Total impaired loans held to maturity, Unpaid Contractual Balance	67,262	79,228
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	12,579	36,573
Impaired loans without a related allowance, Loan Balance	45,845	35,388
Total impaired loans held to maturity, Loan Balance	58,424	71,961
Impaired loans, Related Allowance Recorded	3,266	6,717
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	25,468	27,235
Impaired loans without a related allowance, Avg. Loan Balance	39,777	50,768
Total impaired loans held to maturity, Avg. Loan Balance	65,245	78,003
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	49	787
Impaired loans without a related allowance, Interest Income Recognized	387	933
Total impaired loans held to maturity, Interest Income Recognized	436	1,720
Commercial
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	5,063	7,901
Impaired loans without a related allowance, Unpaid Contractual Balance	3,879	7,724
Total impaired loans held to maturity, Unpaid Contractual Balance	8,942	15,625
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	4,987	7,901
Impaired loans without a related allowance, Loan Balance	3,185	6,743
Total impaired loans held to maturity, Loan Balance	8,172	14,644
Impaired loans, Related Allowance Recorded	603	2,817
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	7,690	5,343
Impaired loans without a related allowance, Avg. Loan Balance	5,368	9,394
Total impaired loans held to maturity, Avg. Loan Balance	13,058	14,737
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	5	38
Impaired loans without a related allowance, Interest Income Recognized	20	89
Total impaired loans held to maturity, Interest Income Recognized	25	127
Commercial Real Estate
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	906	9,164
Impaired loans without a related allowance, Unpaid Contractual Balance	32,538	24,830
Total impaired loans held to maturity, Unpaid Contractual Balance	33,444	33,994
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	887	8,909
Impaired loans without a related allowance, Loan Balance	26,516	19,390
Total impaired loans held to maturity, Loan Balance	27,403	28,299
Impaired loans, Related Allowance Recorded	365	818
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	3,971	7,686
Impaired loans without a related allowance, Avg. Loan Balance	22,806	25,676
Total impaired loans held to maturity, Avg. Loan Balance	26,777	33,362
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	8	282
Impaired loans without a related allowance, Interest Income Recognized	272	538
Total impaired loans held to maturity, Interest Income Recognized	280	820
Commercial and Commercial Real Estate
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	5,969	17,065
Impaired loans without a related allowance, Unpaid Contractual Balance	36,417	32,554
Total impaired loans held to maturity, Unpaid Contractual Balance	42,386	49,619
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	5,874	16,810
Impaired loans without a related allowance, Loan Balance	29,701	26,133
Total impaired loans held to maturity, Loan Balance	35,575	42,943
Impaired loans, Related Allowance Recorded	968	3,635
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	11,661	13,029
Impaired loans without a related allowance, Avg. Loan Balance	28,174	35,070
Total impaired loans held to maturity, Avg. Loan Balance	39,835	48,099
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	13	320
Impaired loans without a related allowance, Interest Income Recognized	292	627
Total impaired loans held to maturity, Interest Income Recognized	305	947
Agricultural and Agricultural Real Estate
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	472	13,818
Impaired loans without a related allowance, Unpaid Contractual Balance	10,044	2,849
Total impaired loans held to maturity, Unpaid Contractual Balance	10,516	16,667
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	472	13,818
Impaired loans without a related allowance, Loan Balance	8,534	2,849
Total impaired loans held to maturity, Loan Balance	9,006	16,667
Impaired loans, Related Allowance Recorded	15	756
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	7,070	7,537
Impaired loans without a related allowance, Avg. Loan Balance	5,224	9,985
Total impaired loans held to maturity, Avg. Loan Balance	12,294	17,522
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	2	354
Impaired loans without a related allowance, Interest Income Recognized	30	189
Total impaired loans held to maturity, Interest Income Recognized	32	543
Residential Real Estate
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	1,875	2,460
Impaired loans without a related allowance, Unpaid Contractual Balance	6,309	5,345
Total impaired loans held to maturity, Unpaid Contractual Balance	8,184	7,805
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	1,875	2,460
Impaired loans without a related allowance, Loan Balance	5,793	4,754
Total impaired loans held to maturity, Loan Balance	7,668	7,214
Impaired loans, Related Allowance Recorded	538	605
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	2,286	3,179
Impaired loans without a related allowance, Avg. Loan Balance	4,729	4,198
Total impaired loans held to maturity, Avg. Loan Balance	7,015	7,377
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	4	13
Impaired loans without a related allowance, Interest Income Recognized	50	80
Total impaired loans held to maturity, Interest Income Recognized	54	93
Consumer
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a related allowance, Unpaid Contractual Balance	4,358	3,485
Impaired loans without a related allowance, Unpaid Contractual Balance	1,818	1,652
Total impaired loans held to maturity, Unpaid Contractual Balance	6,176	5,137
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a related allowance, Loan Balance	4,358	3,485
Impaired loans without a related allowance, Loan Balance	1,817	1,652
Total impaired loans held to maturity, Loan Balance	6,175	5,137
Impaired loans, Related Allowance Recorded	1,745	1,721
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a related allowance, Avg. Loan Balance	4,451	3,490
Impaired loans without a related allowance, Avg. Loan Balance	1,650	1,515
Total impaired loans held to maturity, Avg. Loan Balance	6,101	5,005
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a related allowance, Interest Income Recognized	30	100
Impaired loans without a related allowance, Interest Income Recognized	15	37
Total impaired loans held to maturity, Interest Income Recognized	$ 45	$ 137

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5258-111524

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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953550-111524

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Amount of allowance for credit losses related to recorded investment.

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Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.

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Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, for which there is no related allowance for credit losses.

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Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

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