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Fair Value (Estimated fair value financial instruments incl. carrying amounts) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Securities:    
Securities available for sale $ 2,274,215 $ 2,216,753
Held to maturity 247,394 265,494
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial assets:    
Cash and cash equivalents 437,375 196,003
Securities:    
Securities available for sale 25,367 3,484
Held to maturity 0 0
Other investments 0 0
Loans held for sale 0 0
Loans, net 0 0
Cash surrender value on life insurance 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 2,248,848 2,213,269
Held to maturity 247,394 265,494
Other investments 26,656 22,563
Loans held for sale 77,727 44,560
Loans, net 7,217,536 6,291,503
Cash surrender value on life insurance 162,216 142,818
Derivative assets 9,126 3,933
Financial liabilities:    
Short term borrowings 131,139 324,691
Other borrowings 279,087 285,609
Derivative liabilities 5,940 5,167
Significant Unobservable Inputs (Level 3)    
Financial assets:    
Cash and cash equivalents 0 0
Securities:    
Securities available for sale 0 0
Held to maturity 0 0
Other investments 0 0
Loans held for sale 0 0
Loans, net 21,545 23,469
Cash surrender value on life insurance 0 0
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 437,375 196,003
Securities:    
Securities available for sale 2,274,215 2,216,753
Held to maturity 239,908 253,550
Other investments 26,656 22,563
Loans held for sale 77,727 44,560
Loans, net 7,304,336 6,335,778
Cash surrender value on life insurance 162,216 142,818
Derivative assets 9,126 3,933
Financial liabilities:    
Short term borrowings 131,139 324,691
Other borrowings 277,563 285,011
Derivative liabilities 5,739 5,167
Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 437,375 196,003
Securities:    
Securities available for sale 2,274,215 2,216,753
Held to maturity 247,394 265,494
Other investments 26,656 22,563
Loans held for sale 77,727 44,560
Loans, net 7,239,081 6,314,972
Cash surrender value on life insurance 162,216 142,818
Derivative assets 9,126 3,933
Financial liabilities:    
Short term borrowings 131,139 324,691
Other borrowings 279,087 285,609
Derivative liabilities 5,940 5,167
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 1,539 1,738
Interest rate lock commitments | Carrying Amount    
Securities:    
Derivative assets 1,539 1,738
Interest rate lock commitments | Estimated Fair Value    
Securities:    
Derivative assets 1,539 1,738
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 353 80
Financial liabilities:    
Derivative liabilities 69 232
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 353 80
Financial liabilities:    
Derivative liabilities 69 232
Forward commitments | Estimated Fair Value    
Securities:    
Derivative assets 353 80
Financial liabilities:    
Derivative liabilities 69 232
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 1,900,169 1,614,744
Commercial | Commercial | Significant Unobservable Inputs (Level 3)    
Securities:    
Loans, net 6,772 3,212
Commercial | Commercial | Carrying Amount    
Securities:    
Loans, net 1,939,469 1,628,043
Commercial | Commercial | Estimated Fair Value    
Securities:    
Loans, net 1,906,941 1,617,956
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 3,610,845 3,123,062
Commercial | Commercial real estate | Significant Unobservable Inputs (Level 3)    
Securities:    
Loans, net 420 9,480
Commercial | Commercial real estate | Carrying Amount    
Securities:    
Loans, net 3,623,768 3,140,427
Commercial | Commercial real estate | Estimated Fair Value    
Securities:    
Loans, net 3,611,265 3,132,542
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 551,441 500,581
Agricultural and agricultural real estate | Significant Unobservable Inputs (Level 3)    
Securities:    
Loans, net 11,821 8,406
Agricultural and agricultural real estate | Carrying Amount    
Securities:    
Loans, net 570,320 508,075
Agricultural and agricultural real estate | Estimated Fair Value    
Securities:    
Loans, net 563,262 508,987
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 662,644 613,530
Residential real estate | Significant Unobservable Inputs (Level 3)    
Securities:    
Loans, net 590 1,137
Residential real estate | Carrying Amount    
Securities:    
Loans, net 673,628 620,939
Residential real estate | Estimated Fair Value    
Securities:    
Loans, net 663,234 614,667
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 492,437 439,586
Consumer | Significant Unobservable Inputs (Level 3)    
Securities:    
Loans, net 1,942 1,234
Consumer | Carrying Amount    
Securities:    
Loans, net 497,151 438,294
Consumer | Estimated Fair Value    
Securities:    
Loans, net 494,379 440,820
Time deposits in other financial institutions | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial assets:    
Time deposits in other financial institutions 5,836 9,820
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 5,836 9,820
Time deposits in other financial institutions | Estimated Fair Value    
Financial assets:    
Time deposits in other financial institutions 5,836 9,820
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 3,427,819 2,983,128
Demand deposits | Significant Unobservable Inputs (Level 3)    
Financial liabilities:    
Deposits 0 0
Demand deposits | Carrying Amount    
Financial liabilities:    
Deposits 3,427,819 2,983,128
Demand deposits | Estimated Fair Value    
Financial liabilities:    
Deposits 3,427,819 2,983,128
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 4,958,430 4,240,328
Savings deposits | Significant Unobservable Inputs (Level 3)    
Financial liabilities:    
Deposits 0 0
Savings deposits | Carrying Amount    
Financial liabilities:    
Deposits 4,958,430 4,240,328
Savings deposits | Estimated Fair Value    
Financial liabilities:    
Deposits 4,958,430 4,240,328
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 1,125,914 923,453
Time deposits | Significant Unobservable Inputs (Level 3)    
Financial liabilities:    
Deposits 0 0
Time deposits | Carrying Amount    
Financial liabilities:    
Deposits 1,125,914 923,453
Time deposits | Estimated Fair Value    
Financial liabilities:    
Deposits $ 1,125,914 $ 923,453