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Fair Value (Estimated fair value financial instruments (incl. carrying amounts)) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Financial assets:    
Securities available for sale $ 1,690,516 $ 1,578,434
Held to maturity 289,446 294,513
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial assets:    
Cash and cash equivalents 133,228 258,799
Time deposits in other financial institutions 2,355 2,355
Securities available for sale 531 519
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
Quoted Prices in Active Markets for Identical Assets (Level 1) | Demand deposits    
Financial liabilities:    
Deposits 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Savings deposits    
Financial liabilities:    
Deposits 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Time deposits    
Financial liabilities:    
Deposits 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate lock commitments    
Financial assets:    
Derivative assets 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Forward commitments    
Financial assets:    
Derivative assets 0 0
Financial liabilities:    
Derivative liabilities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial    
Financial assets:    
Loans, net 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial real estate    
Financial assets:    
Loans, net 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Agricultural and agricultural real estate    
Financial assets:    
Loans, net 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential real estate    
Financial assets:    
Loans, net 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer    
Financial assets:    
Loans, net 0 0
Significant Other Observable Inputs (Level 2)    
Financial assets:    
Cash and cash equivalents 0 0
Time deposits in other financial institutions 0 0
Securities available for sale 1,687,881 1,575,030
Held to maturity 289,446 294,513
Other investments 22,090 21,208
Loans held for sale 76,565 74,783
Loans, net 5,447,777 4,939,712
Derivative assets 4,202 2,237
Financial liabilities:    
Short term borrowings 325,741 293,898
Other borrowings 267,812 281,271
Derivative liabilities 15,347 8,401
Significant Other Observable Inputs (Level 2) | Demand deposits    
Financial liabilities:    
Deposits 2,079,521 1,914,141
Significant Other Observable Inputs (Level 2) | Savings deposits    
Financial liabilities:    
Deposits 3,702,431 3,367,479
Significant Other Observable Inputs (Level 2) | Time deposits    
Financial liabilities:    
Deposits 1,142,368 1,124,203
Significant Other Observable Inputs (Level 2) | Interest rate lock commitments    
Financial assets:    
Derivative assets 0 0
Significant Other Observable Inputs (Level 2) | Forward commitments    
Financial assets:    
Derivative assets 343 523
Financial liabilities:    
Derivative liabilities 1,623 315
Significant Other Observable Inputs (Level 2) | Commercial    
Financial assets:    
Loans, net 1,270,434 1,256,758
Significant Other Observable Inputs (Level 2) | Commercial real estate    
Financial assets:    
Loans, net 2,530,408 2,303,194
Significant Other Observable Inputs (Level 2) | Agricultural and agricultural real estate    
Financial assets:    
Loans, net 473,559 469,485
Significant Other Observable Inputs (Level 2) | Residential real estate    
Financial assets:    
Loans, net 746,581 529,601
Significant Other Observable Inputs (Level 2) | Consumer    
Financial assets:    
Loans, net 426,795 380,674
Significant Unobservable Inputs (Level 3)    
Financial assets:    
Cash and cash equivalents 0 0
Time deposits in other financial institutions 0 0
Securities available for sale 2,104 2,885
Held to maturity 0 0
Other investments 235 235
Loans held for sale 0 0
Loans, net 9,131 6,354
Derivative assets 0 0
Financial liabilities:    
Short term borrowings 0 0
Other borrowings 0 0
Derivative liabilities 0 0
Significant Unobservable Inputs (Level 3) | Demand deposits    
Financial liabilities:    
Deposits 0 0
Significant Unobservable Inputs (Level 3) | Savings deposits    
Financial liabilities:    
Deposits 0 0
Significant Unobservable Inputs (Level 3) | Time deposits    
Financial liabilities:    
Deposits 0 0
Significant Unobservable Inputs (Level 3) | Interest rate lock commitments    
Financial assets:    
Derivative assets 6,956 3,168
Significant Unobservable Inputs (Level 3) | Forward commitments    
Financial assets:    
Derivative assets 0 0
Financial liabilities:    
Derivative liabilities 0 0
Significant Unobservable Inputs (Level 3) | Commercial    
Financial assets:    
Loans, net 1,344 597
Significant Unobservable Inputs (Level 3) | Commercial real estate    
Financial assets:    
Loans, net 2,609 1,522
Significant Unobservable Inputs (Level 3) | Agricultural and agricultural real estate    
Financial assets:    
Loans, net 0 0
Significant Unobservable Inputs (Level 3) | Residential real estate    
Financial assets:    
Loans, net 3,168 2,330
Significant Unobservable Inputs (Level 3) | Consumer    
Financial assets:    
Loans, net 2,010 1,905
Carrying Amount    
Financial assets:    
Cash and cash equivalents 133,228 258,799
Time deposits in other financial institutions 2,355 2,355
Securities available for sale 1,690,516 1,578,434
Held to maturity 271,300 279,117
Other investments 22,325 21,443
Loans held for sale 76,565 74,783
Loans, net 5,453,267 4,952,801
Derivative assets 4,202 2,237
Financial liabilities:    
Short term borrowings 325,741 293,898
Other borrowings 265,760 263,214
Derivative liabilities 15,347 8,401
Carrying Amount | Demand deposits    
Financial liabilities:    
Deposits 2,079,521 1,914,141
Carrying Amount | Savings deposits    
Financial liabilities:    
Deposits 3,702,431 3,367,479
Carrying Amount | Time deposits    
Financial liabilities:    
Deposits 1,142,368 1,124,203
Carrying Amount | Interest rate lock commitments    
Financial assets:    
Derivative assets 6,956 3,168
Carrying Amount | Forward commitments    
Financial assets:    
Derivative assets 343 523
Financial liabilities:    
Derivative liabilities 1,623 315
Carrying Amount | Commercial    
Financial assets:    
Loans, net 1,278,343 1,262,612
Carrying Amount | Commercial real estate    
Financial assets:    
Loans, net 2,533,220 2,305,908
Carrying Amount | Agricultural and agricultural real estate    
Financial assets:    
Loans, net 467,844 468,533
Carrying Amount | Residential real estate    
Financial assets:    
Loans, net 750,219 536,190
Carrying Amount | Consumer    
Financial assets:    
Loans, net 423,641 379,558
Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 133,228 258,799
Time deposits in other financial institutions 2,355 2,355
Securities available for sale 1,690,516 1,578,434
Held to maturity 289,446 294,513
Other investments 22,325 21,443
Loans held for sale 76,565 74,783
Loans, net 5,456,908 4,946,066
Derivative assets 4,202 2,237
Financial liabilities:    
Short term borrowings 325,741 293,898
Other borrowings 267,812 281,271
Derivative liabilities 15,347 8,401
Estimated Fair Value | Demand deposits    
Financial liabilities:    
Deposits 2,079,521 1,914,141
Estimated Fair Value | Savings deposits    
Financial liabilities:    
Deposits 3,702,431 3,367,479
Estimated Fair Value | Time deposits    
Financial liabilities:    
Deposits 1,142,368 1,124,203
Estimated Fair Value | Interest rate lock commitments    
Financial assets:    
Derivative assets 6,956 3,168
Estimated Fair Value | Forward commitments    
Financial assets:    
Derivative assets 343 523
Financial liabilities:    
Derivative liabilities 1,623 315
Estimated Fair Value | Commercial    
Financial assets:    
Loans, net 1,271,778 1,257,355
Estimated Fair Value | Commercial real estate    
Financial assets:    
Loans, net 2,533,017 2,304,716
Estimated Fair Value | Agricultural and agricultural real estate    
Financial assets:    
Loans, net 473,559 469,485
Estimated Fair Value | Residential real estate    
Financial assets:    
Loans, net 749,749 531,931
Estimated Fair Value | Consumer    
Financial assets:    
Loans, net $ 428,805 $ 382,579