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Fair Value Measurements - Recurring and Nonrecurring (Details) (USD $)
3 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
Carrying Value
Dec. 31, 2012
Carrying Value
Sep. 30, 2013
Level 1
Dec. 31, 2012
Level 1
Sep. 30, 2013
Level 2
Dec. 31, 2012
Level 2
Sep. 30, 2013
Level 3
Dec. 31, 2012
Level 3
Sep. 30, 2013
Fair Value
Dec. 31, 2012
Fair Value
Sep. 30, 2013
Nonrecurring
Level 1
Dec. 31, 2012
Nonrecurring
Level 1
Sep. 30, 2013
Nonrecurring
Level 2
Dec. 31, 2012
Nonrecurring
Level 2
Sep. 30, 2013
Nonrecurring
Level 3
Dec. 31, 2012
Nonrecurring
Level 3
Sep. 30, 2013
Nonrecurring
Fair Value
Dec. 31, 2012
Nonrecurring
Fair Value
Sep. 30, 2013
Recurring
Level 1
Dec. 31, 2012
Recurring
Level 1
Sep. 30, 2013
Recurring
Level 2
Dec. 31, 2012
Recurring
Level 2
Sep. 30, 2013
Recurring
Level 3
Dec. 31, 2012
Recurring
Level 3
Sep. 30, 2013
Recurring
Fair Value
Dec. 31, 2012
Recurring
Fair Value
Sep. 30, 2013
U.S. Government agencies
Recurring
Level 1
Dec. 31, 2012
U.S. Government agencies
Recurring
Level 1
Sep. 30, 2013
U.S. Government agencies
Recurring
Level 2
Dec. 31, 2012
U.S. Government agencies
Recurring
Level 2
Sep. 30, 2013
U.S. Government agencies
Recurring
Level 3
Dec. 31, 2012
U.S. Government agencies
Recurring
Level 3
Sep. 30, 2013
U.S. Government agencies
Recurring
Fair Value
Dec. 31, 2012
U.S. Government agencies
Recurring
Fair Value
Sep. 30, 2013
Obligations of states and political subdivisions
Recurring
Level 1
Dec. 31, 2012
Obligations of states and political subdivisions
Recurring
Level 1
Sep. 30, 2013
Obligations of states and political subdivisions
Recurring
Level 2
Dec. 31, 2012
Obligations of states and political subdivisions
Recurring
Level 2
Sep. 30, 2013
Obligations of states and political subdivisions
Recurring
Level 3
Dec. 31, 2012
Obligations of states and political subdivisions
Recurring
Level 3
Sep. 30, 2013
Obligations of states and political subdivisions
Recurring
Fair Value
Dec. 31, 2012
Obligations of states and political subdivisions
Recurring
Fair Value
Sep. 30, 2013
U.S. Government agencies collateralized by residential mortgage obligations
Recurring
Level 1
Dec. 31, 2012
U.S. Government agencies collateralized by residential mortgage obligations
Recurring
Level 1
Sep. 30, 2013
U.S. Government agencies collateralized by residential mortgage obligations
Recurring
Level 2
Dec. 31, 2012
U.S. Government agencies collateralized by residential mortgage obligations
Recurring
Level 2
Sep. 30, 2013
U.S. Government agencies collateralized by residential mortgage obligations
Recurring
Level 3
Dec. 31, 2012
U.S. Government agencies collateralized by residential mortgage obligations
Recurring
Level 3
Sep. 30, 2013
U.S. Government agencies collateralized by residential mortgage obligations
Recurring
Fair Value
Dec. 31, 2012
U.S. Government agencies collateralized by residential mortgage obligations
Recurring
Fair Value
Sep. 30, 2013
Private label residential mortgage backed securities
Recurring
Level 1
Dec. 31, 2012
Private label residential mortgage backed securities
Recurring
Level 1
Sep. 30, 2013
Private label residential mortgage backed securities
Recurring
Level 2
Dec. 31, 2012
Private label residential mortgage backed securities
Recurring
Level 2
Sep. 30, 2013
Private label residential mortgage backed securities
Recurring
Level 3
Dec. 31, 2012
Private label residential mortgage backed securities
Recurring
Level 3
Sep. 30, 2013
Private label residential mortgage backed securities
Recurring
Fair Value
Dec. 31, 2012
Private label residential mortgage backed securities
Recurring
Fair Value
Sep. 30, 2013
Other equity securities
Recurring
Level 1
Dec. 31, 2012
Other equity securities
Recurring
Level 1
Sep. 30, 2013
Other equity securities
Recurring
Level 2
Dec. 31, 2012
Other equity securities
Recurring
Level 2
Sep. 30, 2013
Other equity securities
Recurring
Level 3
Dec. 31, 2012
Other equity securities
Recurring
Level 3
Sep. 30, 2013
Other equity securities
Recurring
Fair Value
Dec. 31, 2012
Other equity securities
Recurring
Fair Value
Sep. 30, 2013
Impaired loans
Nonrecurring
Carrying Value
Dec. 31, 2012
Impaired loans
Nonrecurring
Carrying Value
Sep. 30, 2013
Impaired loans
Nonrecurring
Level 1
Dec. 31, 2012
Impaired loans
Nonrecurring
Level 1
Sep. 30, 2013
Impaired loans
Nonrecurring
Level 2
Dec. 31, 2012
Impaired loans
Nonrecurring
Level 2
Sep. 30, 2013
Impaired loans
Nonrecurring
Level 3
Dec. 31, 2012
Impaired loans
Nonrecurring
Level 3
Sep. 30, 2013
Impaired loans
Nonrecurring
Fair Value
Dec. 31, 2012
Impaired loans
Nonrecurring
Fair Value
Sep. 30, 2013
Commercial
Mar. 31, 2013
Commercial
Dec. 31, 2012
Commercial
Sep. 30, 2012
Commercial
Mar. 31, 2012
Commercial
Dec. 31, 2011
Commercial
Sep. 30, 2013
Commercial
Impaired loans
Nonrecurring
Level 1
Sep. 30, 2012
Commercial
Impaired loans
Nonrecurring
Level 1
Sep. 30, 2013
Commercial
Impaired loans
Nonrecurring
Level 2
Sep. 30, 2012
Commercial
Impaired loans
Nonrecurring
Level 2
Sep. 30, 2013
Commercial
Impaired loans
Nonrecurring
Level 3
Sep. 30, 2012
Commercial
Impaired loans
Nonrecurring
Level 3
Sep. 30, 2013
Commercial
Impaired loans
Nonrecurring
Fair Value
Sep. 30, 2012
Commercial
Impaired loans
Nonrecurring
Fair Value
Sep. 30, 2013
Commercial
Impaired loans
Commercial and industrial
Nonrecurring
Level 1
Sep. 30, 2012
Commercial
Impaired loans
Commercial and industrial
Nonrecurring
Level 1
Sep. 30, 2013
Commercial
Impaired loans
Commercial and industrial
Nonrecurring
Level 2
Sep. 30, 2012
Commercial
Impaired loans
Commercial and industrial
Nonrecurring
Level 2
Sep. 30, 2013
Commercial
Impaired loans
Commercial and industrial
Nonrecurring
Level 3
Sep. 30, 2012
Commercial
Impaired loans
Commercial and industrial
Nonrecurring
Level 3
Sep. 30, 2013
Commercial
Impaired loans
Commercial and industrial
Nonrecurring
Fair Value
Sep. 30, 2012
Commercial
Impaired loans
Commercial and industrial
Nonrecurring
Fair Value
Sep. 30, 2013
Commercial
Impaired loans
Agricultural land and production
Nonrecurring
Level 1
Sep. 30, 2012
Commercial
Impaired loans
Agricultural land and production
Nonrecurring
Level 1
Sep. 30, 2013
Commercial
Impaired loans
Agricultural land and production
Nonrecurring
Level 2
Sep. 30, 2012
Commercial
Impaired loans
Agricultural land and production
Nonrecurring
Level 2
Sep. 30, 2013
Commercial
Impaired loans
Agricultural land and production
Nonrecurring
Level 3
Sep. 30, 2012
Commercial
Impaired loans
Agricultural land and production
Nonrecurring
Level 3
Sep. 30, 2013
Commercial
Impaired loans
Agricultural land and production
Nonrecurring
Fair Value
Sep. 30, 2012
Commercial
Impaired loans
Agricultural land and production
Nonrecurring
Fair Value
Sep. 30, 2013
Real Estate Portfolio Segment
Mar. 31, 2013
Real Estate Portfolio Segment
Dec. 31, 2012
Real Estate Portfolio Segment
Sep. 30, 2012
Real Estate Portfolio Segment
Mar. 31, 2012
Real Estate Portfolio Segment
Dec. 31, 2011
Real Estate Portfolio Segment
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Nonrecurring
Level 1
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Nonrecurring
Level 1
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Nonrecurring
Level 2
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Nonrecurring
Level 2
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Nonrecurring
Level 3
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Nonrecurring
Level 3
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Nonrecurring
Fair Value
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Nonrecurring
Fair Value
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Owner occupied
Nonrecurring
Level 1
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Owner occupied
Nonrecurring
Level 1
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Owner occupied
Nonrecurring
Level 2
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Owner occupied
Nonrecurring
Level 2
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Owner occupied
Nonrecurring
Level 3
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Owner occupied
Nonrecurring
Level 3
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Owner occupied
Nonrecurring
Fair Value
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Owner occupied
Nonrecurring
Fair Value
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Real estate construction and other land loans
Nonrecurring
Level 1
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Real estate construction and other land loans
Nonrecurring
Level 1
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Real estate construction and other land loans
Nonrecurring
Level 2
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Real estate construction and other land loans
Nonrecurring
Level 2
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Real estate construction and other land loans
Nonrecurring
Level 3
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Real estate construction and other land loans
Nonrecurring
Level 3
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Real estate construction and other land loans
Nonrecurring
Fair Value
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Real estate construction and other land loans
Nonrecurring
Fair Value
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Commercial real estate
Nonrecurring
Level 1
Sep. 30, 2012
Real Estate Portfolio Segment
Impaired loans
Commercial real estate
Nonrecurring
Level 1
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Commercial real estate
Nonrecurring
Level 2
Sep. 30, 2012
Real Estate Portfolio Segment
Impaired loans
Commercial real estate
Nonrecurring
Level 2
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Commercial real estate
Nonrecurring
Level 3
Sep. 30, 2012
Real Estate Portfolio Segment
Impaired loans
Commercial real estate
Nonrecurring
Level 3
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Commercial real estate
Nonrecurring
Fair Value
Sep. 30, 2012
Real Estate Portfolio Segment
Impaired loans
Commercial real estate
Nonrecurring
Fair Value
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Agricultural real estate
Nonrecurring
Level 1
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Agricultural real estate
Nonrecurring
Level 1
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Agricultural real estate
Nonrecurring
Level 2
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Agricultural real estate
Nonrecurring
Level 2
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Agricultural real estate
Nonrecurring
Level 3
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Agricultural real estate
Nonrecurring
Level 3
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Agricultural real estate
Nonrecurring
Fair Value
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Agricultural real estate
Nonrecurring
Fair Value
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Other real estate
Nonrecurring
Level 1
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Other real estate
Nonrecurring
Level 1
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Other real estate
Nonrecurring
Level 2
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Other real estate
Nonrecurring
Level 2
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Other real estate
Nonrecurring
Level 3
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Other real estate
Nonrecurring
Level 3
Sep. 30, 2013
Real Estate Portfolio Segment
Impaired loans
Other real estate
Nonrecurring
Fair Value
Dec. 31, 2012
Real Estate Portfolio Segment
Impaired loans
Other real estate
Nonrecurring
Fair Value
Sep. 30, 2013
Consumer
Mar. 31, 2013
Consumer
Dec. 31, 2012
Consumer
Sep. 30, 2012
Consumer
Mar. 31, 2012
Consumer
Dec. 31, 2011
Consumer
Sep. 30, 2013
Consumer
Impaired loans
Nonrecurring
Level 1
Dec. 31, 2012
Consumer
Impaired loans
Nonrecurring
Level 1
Sep. 30, 2013
Consumer
Impaired loans
Nonrecurring
Level 2
Dec. 31, 2012
Consumer
Impaired loans
Nonrecurring
Level 2
Sep. 30, 2013
Consumer
Impaired loans
Nonrecurring
Level 3
Dec. 31, 2012
Consumer
Impaired loans
Nonrecurring
Level 3
Sep. 30, 2013
Consumer
Impaired loans
Nonrecurring
Fair Value
Dec. 31, 2012
Consumer
Impaired loans
Nonrecurring
Fair Value
Sep. 30, 2013
Consumer
Impaired loans
Equity loans and lines of credit
Nonrecurring
Level 1
Dec. 31, 2012
Consumer
Impaired loans
Equity loans and lines of credit
Nonrecurring
Level 1
Sep. 30, 2013
Consumer
Impaired loans
Equity loans and lines of credit
Nonrecurring
Level 2
Dec. 31, 2012
Consumer
Impaired loans
Equity loans and lines of credit
Nonrecurring
Level 2
Sep. 30, 2013
Consumer
Impaired loans
Equity loans and lines of credit
Nonrecurring
Level 3
Dec. 31, 2012
Consumer
Impaired loans
Equity loans and lines of credit
Nonrecurring
Level 3
Sep. 30, 2013
Consumer
Impaired loans
Equity loans and lines of credit
Nonrecurring
Fair Value
Dec. 31, 2012
Consumer
Impaired loans
Equity loans and lines of credit
Nonrecurring
Fair Value
Sep. 30, 2012
Consumer
Impaired loans
Consumer and installment
Nonrecurring
Level 1
Sep. 30, 2012
Consumer
Impaired loans
Consumer and installment
Nonrecurring
Level 2
Sep. 30, 2012
Consumer
Impaired loans
Consumer and installment
Nonrecurring
Level 3
Sep. 30, 2012
Consumer
Impaired loans
Consumer and installment
Nonrecurring
Fair Value
Sep. 30, 2013
Lease financing receivable
Impaired loans
Nonrecurring
Level 1
Dec. 31, 2012
Lease financing receivable
Impaired loans
Nonrecurring
Level 1
Sep. 30, 2013
Lease financing receivable
Impaired loans
Nonrecurring
Level 2
Dec. 31, 2012
Lease financing receivable
Impaired loans
Nonrecurring
Level 2
Sep. 30, 2013
Lease financing receivable
Impaired loans
Nonrecurring
Level 3
Dec. 31, 2012
Lease financing receivable
Impaired loans
Nonrecurring
Level 3
Sep. 30, 2013
Lease financing receivable
Impaired loans
Nonrecurring
Fair Value
Dec. 31, 2012
Lease financing receivable
Impaired loans
Nonrecurring
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                                                                                                                                                                                                                                                                                                                                                                                                    
Available-for-sale investment securities                 $ 417,833,000 $ 393,965,000 $ 7,626,000 $ 7,948,000 $ 410,207,000 $ 386,017,000 $ 0 $ 0 $ 417,833,000 $ 393,965,000                                 $ 0 $ 0 $ 16,579,000 $ 9,454,000 $ 0 $ 0 $ 16,579,000 $ 9,454,000 $ 0 $ 0 $ 184,595,000 $ 161,678,000 $ 0 $ 0 $ 184,595,000 $ 161,678,000 $ 0 $ 0 $ 203,361,000 $ 208,510,000 $ 0 $ 0 $ 203,361,000 $ 208,510,000 $ 0 $ 0 $ 5,672,000 $ 6,375,000 $ 0 $ 0 $ 5,672,000 $ 6,375,000 $ 7,626,000 $ 7,948,000 $ 0 $ 0 $ 0 $ 0 $ 7,626,000 $ 7,948,000                                                                                                                                                                                                                                                                
Loans receivable                 505,501,000 385,185,000 0 0 0 0 509,109,000 388,834,000 509,109,000 388,834,000                                                                                                                 1,355,000 5,386,000 0 0 0 0 671,000 5,290,000 671,000 5,290,000             0 0 0 0 610,000 0 610,000 0 0 0 0 0 610,000 0 610,000 0 0 0 0 0 0 0 0 0             0 0 0 0 0 5,057,000 0 5,057,000 0 0 0 0 0 194,000 0 194,000 0 0 0 0 0 4,863,000 0 4,863,000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0             0 0 0 0 61,000 233,000 61,000 233,000 0 0 0 0 61,000 233,000 61,000 233,000 0 0 0 0 0 0 0 0 0 0 0 0
Other real estate owned                                     0 0 0 0 0 0 0 0                                                                                                                                                                                                                                                                                                                                                                
Assets, fair value                                     0 0 0 0 671,000 5,290,000 671,000 5,290,000 7,626,000 7,948,000 410,207,000 386,017,000 0 0 417,833,000 393,965,000                                                                                                                                                                                                                                                                                                                                                
Valuation allowance 9,732,000 10,214,000 9,732,000 10,214,000 9,601,000 10,133,000 10,140,000 11,396,000                                                                                                                                     684,000 96,000                 2,846,000 2,792,000 2,676,000 2,678,000 2,799,000 2,266,000                                                 4,734,000 5,057,000 5,877,000 6,006,000 5,474,000 7,155,000                                                                                                 1,317,000 1,252,000 1,541,000 1,511,000 1,494,000 1,836,000                                                        
Provision for credit losses $ 0 $ 0 $ 0 $ 500,000                                                                                                                                             $ 588,000 $ 19,000