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Fair Value (Estimated fair value financial instruments (incl. carrying amounts)) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Securities:    
Securities available for sale $ 2,093,385 $ 1,845,864
Held to maturity 270,386 274,799
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial assets:    
Cash and cash equivalents 251,736 158,724
Securities:    
Securities available for sale 3,505 517
Held to maturity 0 0
Other investments 0 0
Loans held for sale 0 0
Loans, net 0 0
Derivative assets 0 0
Financial liabilities:    
Short term borrowings 0 0
Other borrowings 0 0
Derivative liabilities 0 0
Significant Other Observable Inputs (Level 2)    
Financial assets:    
Cash and cash equivalents 0 0
Securities:    
Securities available for sale 2,089,880 1,843,123
Held to maturity 270,386 274,799
Other investments 22,981 21,365
Loans held for sale 35,795 61,261
Loans, net 6,271,749 5,259,690
Derivative assets 3,386 3,222
Financial liabilities:    
Short term borrowings 171,871 306,459
Other borrowings 305,741 288,534
Derivative liabilities 6,309 7,027
Significant Unobservable Inputs (Level 3)    
Financial assets:    
Cash and cash equivalents 0 0
Securities:    
Securities available for sale 0 2,224
Held to maturity 0 0
Other investments 195 195
Loans held for sale 0 0
Loans, net 22,487 11,422
Derivative assets 0 0
Financial liabilities:    
Short term borrowings 0 0
Other borrowings 0 0
Derivative liabilities 0 0
Carrying Amount    
Financial assets:    
Cash and cash equivalents 251,736 158,724
Securities:    
Securities available for sale 2,093,385 1,845,864
Held to maturity 256,355 263,662
Other investments 23,176 21,560
Loans held for sale 35,795 61,261
Loans, net 6,320,121 5,297,395
Derivative assets 3,386 3,222
Financial liabilities:    
Short term borrowings 171,871 306,459
Other borrowings 301,473 288,534
Derivative liabilities 6,309 7,027
Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 251,736 158,724
Securities:    
Securities available for sale 2,093,385 1,845,864
Held to maturity 270,386 274,799
Other investments 23,176 21,560
Loans held for sale 35,795 61,261
Loans, net 6,294,236 5,271,112
Derivative assets 3,386 3,222
Financial liabilities:    
Short term borrowings 171,871 306,459
Other borrowings 305,741 288,534
Derivative liabilities 6,309 7,027
Interest rate lock commitments | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Securities:    
Derivative assets 0 0
Interest rate lock commitments | Significant Other Observable Inputs (Level 2)    
Securities:    
Derivative assets 0 0
Interest rate lock commitments | Significant Unobservable Inputs (Level 3)    
Securities:    
Derivative assets 2,463 2,790
Interest rate lock commitments | Carrying Amount    
Securities:    
Derivative assets 2,463 2,790
Interest rate lock commitments | Estimated Fair Value    
Securities:    
Derivative assets 2,463 2,790
Forward commitments | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Securities:    
Derivative assets 0 0
Financial liabilities:    
Derivative liabilities 0 0
Forward commitments | Significant Other Observable Inputs (Level 2)    
Securities:    
Derivative assets 237 2,546
Financial liabilities:    
Derivative liabilities 261 266
Forward commitments | Significant Unobservable Inputs (Level 3)    
Securities:    
Derivative assets 0 0
Financial liabilities:    
Derivative liabilities 0 0
Forward commitments | Carrying Amount    
Securities:    
Derivative assets 237 2,546
Financial liabilities:    
Derivative liabilities 261 266
Forward commitments | Estimated Fair Value    
Securities:    
Derivative assets 237 2,546
Financial liabilities:    
Derivative liabilities 261 266
Commercial | Commercial | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Securities:    
Loans, net 0 0
Commercial | Commercial | Significant Other Observable Inputs (Level 2)    
Securities:    
Loans, net 1,597,795 1,257,071
Commercial | Commercial | Significant Unobservable Inputs (Level 3)    
Securities:    
Loans, net 3,556 1,683
Commercial | Commercial | Carrying Amount    
Securities:    
Loans, net 1,596,934 1,272,089
Commercial | Commercial | Estimated Fair Value    
Securities:    
Loans, net 1,601,351 1,258,754
Commercial | Commercial real estate | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Securities:    
Loans, net 0 0
Commercial | Commercial real estate | Significant Other Observable Inputs (Level 2)    
Securities:    
Loans, net 3,109,111 2,503,832
Commercial | Commercial real estate | Significant Unobservable Inputs (Level 3)    
Securities:    
Loans, net 8,718 3,026
Commercial | Commercial real estate | Carrying Amount    
Securities:    
Loans, net 3,143,414 2,513,446
Commercial | Commercial real estate | Estimated Fair Value    
Securities:    
Loans, net 3,117,829 2,506,858
Agricultural and agricultural real estate | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Securities:    
Loans, net 0 0
Agricultural and agricultural real estate | Significant Other Observable Inputs (Level 2)    
Securities:    
Loans, net 500,038 485,046
Agricultural and agricultural real estate | Significant Unobservable Inputs (Level 3)    
Securities:    
Loans, net 7,936 1,955
Agricultural and agricultural real estate | Carrying Amount    
Securities:    
Loans, net 506,388 485,820
Agricultural and agricultural real estate | Estimated Fair Value    
Securities:    
Loans, net 507,974 487,001
Residential real estate | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Securities:    
Loans, net 0 0
Residential real estate | Significant Other Observable Inputs (Level 2)    
Securities:    
Loans, net 621,333 600,668
Residential real estate | Significant Unobservable Inputs (Level 3)    
Securities:    
Loans, net 1,365 3,565
Residential real estate | Carrying Amount    
Securities:    
Loans, net 632,306 614,207
Residential real estate | Estimated Fair Value    
Securities:    
Loans, net 622,698 604,233
Consumer | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Securities:    
Loans, net 0 0
Consumer | Significant Other Observable Inputs (Level 2)    
Securities:    
Loans, net 443,472 413,073
Consumer | Significant Unobservable Inputs (Level 3)    
Securities:    
Loans, net 912 1,193
Consumer | Carrying Amount    
Securities:    
Loans, net 441,079 411,833
Consumer | Estimated Fair Value    
Securities:    
Loans, net 444,384 414,266
Time deposits in other financial institutions | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial assets:    
Time deposits in other financial institutions 19,793 2,105
Time deposits in other financial institutions | Significant Other Observable Inputs (Level 2)    
Financial assets:    
Time deposits in other financial institutions 0 0
Time deposits in other financial institutions | Significant Unobservable Inputs (Level 3)    
Financial assets:    
Time deposits in other financial institutions 0 0
Time deposits in other financial institutions | Carrying Amount    
Financial assets:    
Time deposits in other financial institutions 19,793 2,105
Time deposits in other financial institutions | Estimated Fair Value    
Financial assets:    
Time deposits in other financial institutions 19,793 2,105
Demand deposits | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial liabilities:    
Deposits 0 0
Demand deposits | Significant Other Observable Inputs (Level 2)    
Financial liabilities:    
Deposits 3,009,940 2,202,036
Demand deposits | Significant Unobservable Inputs (Level 3)    
Financial liabilities:    
Deposits 0 0
Demand deposits | Carrying Amount    
Financial liabilities:    
Deposits 3,009,940 2,202,036
Demand deposits | Estimated Fair Value    
Financial liabilities:    
Deposits 3,009,940 2,202,036
Savings deposits | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial liabilities:    
Deposits 0 0
Savings deposits | Significant Other Observable Inputs (Level 2)    
Financial liabilities:    
Deposits 4,227,340 3,788,089
Savings deposits | Significant Unobservable Inputs (Level 3)    
Financial liabilities:    
Deposits 0 0
Savings deposits | Carrying Amount    
Financial liabilities:    
Deposits 4,227,340 3,788,089
Savings deposits | Estimated Fair Value    
Financial liabilities:    
Deposits 4,227,340 3,788,089
Time deposits | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial liabilities:    
Deposits 0 0
Time deposits | Significant Other Observable Inputs (Level 2)    
Financial liabilities:    
Deposits 994,604 857,286
Time deposits | Significant Unobservable Inputs (Level 3)    
Financial liabilities:    
Deposits 0 0
Time deposits | Carrying Amount    
Financial liabilities:    
Deposits 994,604 857,286
Time deposits | Estimated Fair Value    
Financial liabilities:    
Deposits $ 994,604 $ 857,286