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Fair Value (Estimated fair value financial instruments (incl. carrying amounts)) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Securities:    
Securities available for sale $ 1,893,528 $ 1,845,864
Held to maturity 272,797 274,799
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial assets:    
Cash and cash equivalents 173,151 158,724
Time deposits in other financial institutions 41,539 2,105
Securities:    
Securities available for sale 10,496 517
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
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    
Securities:    
Derivative assets 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Forward commitments    
Securities:    
Derivative assets 0 0
Financial liabilities:    
Derivative liabilities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial | Commercial    
Securities:    
Loans, net 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial | Commercial real estate    
Securities:    
Loans, net 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Agricultural and agricultural real estate    
Securities:    
Loans, net 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential real estate    
Securities:    
Loans, net 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer    
Securities:    
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:    
Securities available for sale 1,883,032 1,843,123
Held to maturity 272,797 274,799
Other investments 21,362 21,365
Loans held for sale 49,009 61,261
Loans, net 5,271,109 5,259,690
Derivative assets 3,278 3,222
Financial liabilities:    
Short term borrowings 155,025 306,459
Other borrowings 282,346 288,534
Derivative liabilities 6,237 7,027
Significant Other Observable Inputs (Level 2) | Demand deposits    
Financial liabilities:    
Deposits 2,319,256 2,202,036
Significant Other Observable Inputs (Level 2) | Savings deposits    
Financial liabilities:    
Deposits 3,940,146 3,788,089
Significant Other Observable Inputs (Level 2) | Time deposits    
Financial liabilities:    
Deposits 830,459 857,286
Significant Other Observable Inputs (Level 2) | Interest rate lock commitments    
Securities:    
Derivative assets 0 0
Significant Other Observable Inputs (Level 2) | Forward commitments    
Securities:    
Derivative assets 176 2,546
Financial liabilities:    
Derivative liabilities 634 266
Significant Other Observable Inputs (Level 2) | Commercial | Commercial    
Securities:    
Loans, net 1,270,138 1,257,071
Significant Other Observable Inputs (Level 2) | Commercial | Commercial real estate    
Securities:    
Loans, net 2,512,661 2,503,832
Significant Other Observable Inputs (Level 2) | Agricultural and agricultural real estate    
Securities:    
Loans, net 478,600 485,046
Significant Other Observable Inputs (Level 2) | Residential real estate    
Securities:    
Loans, net 589,159 600,668
Significant Other Observable Inputs (Level 2) | Consumer    
Securities:    
Loans, net 420,551 413,073
Significant Unobservable Inputs (Level 3)    
Financial assets:    
Cash and cash equivalents 0 0
Time deposits in other financial institutions 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 6,413 11,422
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    
Securities:    
Derivative assets 3,745 2,790
Significant Unobservable Inputs (Level 3) | Forward commitments    
Securities:    
Derivative assets 0 0
Financial liabilities:    
Derivative liabilities 0 0
Significant Unobservable Inputs (Level 3) | Commercial | Commercial    
Securities:    
Loans, net 1,216 1,683
Significant Unobservable Inputs (Level 3) | Commercial | Commercial real estate    
Securities:    
Loans, net 1,490 3,026
Significant Unobservable Inputs (Level 3) | Agricultural and agricultural real estate    
Securities:    
Loans, net 534 1,955
Significant Unobservable Inputs (Level 3) | Residential real estate    
Securities:    
Loans, net 2,097 3,565
Significant Unobservable Inputs (Level 3) | Consumer    
Securities:    
Loans, net 1,076 1,193
Carrying Amount    
Financial assets:    
Cash and cash equivalents 173,151 158,724
Time deposits in other financial institutions 41,539 2,105
Securities:    
Securities available for sale 1,893,528 1,845,864
Held to maturity 260,616 263,662
Other investments 21,557 21,560
Loans held for sale 49,009 61,261
Loans, net 5,306,605 5,297,395
Derivative assets 3,278 3,222
Financial liabilities:    
Short term borrowings 155,025 306,459
Other borrowings 282,051 288,534
Derivative liabilities 6,237 7,027
Carrying Amount | Demand deposits    
Financial liabilities:    
Deposits 2,319,256 2,202,036
Carrying Amount | Savings deposits    
Financial liabilities:    
Deposits 3,940,146 3,788,089
Carrying Amount | Time deposits    
Financial liabilities:    
Deposits 830,459 857,286
Carrying Amount | Interest rate lock commitments    
Securities:    
Derivative assets 3,745 2,790
Carrying Amount | Forward commitments    
Securities:    
Derivative assets 176 2,546
Financial liabilities:    
Derivative liabilities 634 266
Carrying Amount | Commercial | Commercial    
Securities:    
Loans, net 1,297,723 1,272,089
Carrying Amount | Commercial | Commercial real estate    
Securities:    
Loans, net 2,510,614 2,513,446
Carrying Amount | Agricultural and agricultural real estate    
Securities:    
Loans, net 477,867 485,820
Carrying Amount | Residential real estate    
Securities:    
Loans, net 601,314 614,207
Carrying Amount | Consumer    
Securities:    
Loans, net 419,087 411,833
Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 173,151 158,724
Time deposits in other financial institutions 41,539 2,105
Securities:    
Securities available for sale 1,893,528 1,845,864
Held to maturity 272,797 274,799
Other investments 21,557 21,560
Loans held for sale 49,009 61,261
Loans, net 5,277,522 5,271,112
Derivative assets 3,278 3,222
Financial liabilities:    
Short term borrowings 155,025 306,459
Other borrowings 282,346 288,534
Derivative liabilities 6,237 7,027
Estimated Fair Value | Demand deposits    
Financial liabilities:    
Deposits 2,319,256 2,202,036
Estimated Fair Value | Savings deposits    
Financial liabilities:    
Deposits 3,940,146 3,788,089
Estimated Fair Value | Time deposits    
Financial liabilities:    
Deposits 830,459 857,286
Estimated Fair Value | Interest rate lock commitments    
Securities:    
Derivative assets 3,745 2,790
Estimated Fair Value | Forward commitments    
Securities:    
Derivative assets 176 2,546
Financial liabilities:    
Derivative liabilities 634 266
Estimated Fair Value | Commercial | Commercial    
Securities:    
Loans, net 1,271,354 1,258,754
Estimated Fair Value | Commercial | Commercial real estate    
Securities:    
Loans, net 2,514,151 2,506,858
Estimated Fair Value | Agricultural and agricultural real estate    
Securities:    
Loans, net 479,134 487,001
Estimated Fair Value | Residential real estate    
Securities:    
Loans, net 591,256 604,233
Estimated Fair Value | Consumer    
Securities:    
Loans, net $ 421,627 $ 414,266