Commitments, Guarantees, and Contingent Liabilities (Details) - Contractual or Notional Amounts of Financial Instruments (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014		Dec. 31, 2013
Note 11 - Commitments, Guarantees, and Contingent Liabilities (Details) - Contractual or Notional Amounts of Financial Instruments [Line Items]
Unamortized fees associated with letters of credit	$ 563	[1],[2]	$ 582	[1],[2]
Remaining weighted-average term, in months	8 months 14 days		9 months 25 days
Recourse on assets sold: [Abstract]
Unpaid principal balance of loans sold	174,348		170,330
Carrying value of recourse obligation	159	[2]	162	[2]
Minimum [Member]
Note 11 - Commitments, Guarantees, and Contingent Liabilities (Details) - Contractual or Notional Amounts of Financial Instruments [Line Items]
Remaining lives, in years	36 days		36 days
Maximum [Member]
Note 11 - Commitments, Guarantees, and Contingent Liabilities (Details) - Contractual or Notional Amounts of Financial Instruments [Line Items]
Remaining lives, in years	14 years 6 months		14 years 8 months 12 days
Letter of Credit [Member]
Note 11 - Commitments, Guarantees, and Contingent Liabilities (Details) - Contractual or Notional Amounts of Financial Instruments [Line Items]
Commercial and industrial	67,851		64,015
Agricultural	1,344		1,581
Commercial real estate	39,230		43,771
Consumer	1,028		1,086
Total letters of credit	109,453		110,453
Commitments to Extend Credit [Member]
Note 11 - Commitments, Guarantees, and Contingent Liabilities (Details) - Contractual or Notional Amounts of Financial Instruments [Line Items]
Commercial and industrial	1,010,276		1,020,617
Agricultural	61,960		56,584
Commercial real estate	145,347		133,867
Home equity	274,639		268,311
Installment	11,109		10,746
Overdraft protection program	170,721	[3]	170,956	[3]
Total commitments	$ 1,674,052		$ 1,661,081

[1] The Company is amortizing these amounts into income over the commitment period.

[2] Included in other liabilities in the Consolidated Statements of Financial Condition.

[3] Federal regulations regarding electronic fund transfers require customers to affirmatively consent to the institution's overdraft service for automated teller machine and one-time debit card transactions before overdraft fees may be assessed on the account. Customers are provided a specific line for the amount they may overdraw.