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Loans - Credit Exposure for Loans as Determined by Company's Internal Risk Rating System (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Loans [Line Items]      
Total Loans $ 4,246,941 $ 4,092,308 $ 3,702,334
Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 2,756,144 2,644,571  
Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 822,652 830,815  
Consumer [Member]      
Loans [Line Items]      
Total Loans 22,191 24,710  
Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 645,954 592,212  
Originated and acquired loans [Member]      
Loans [Line Items]      
Total Loans 4,183,414 4,021,429  
Originated and acquired loans [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 2,737,005 2,624,173  
Originated and acquired loans [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 815,144 820,820  
Originated and acquired loans [Member] | Consumer [Member]      
Loans [Line Items]      
Total Loans 22,189 24,617  
Originated and acquired loans [Member] | Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 609,076 551,819  
ASC 310-30 [Member]      
Loans [Line Items]      
Total Loans 63,527 70,879 $ 112,309
ASC 310-30 [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 19,139 20,398  
ASC 310-30 [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 7,508 9,995  
ASC 310-30 [Member] | Consumer [Member]      
Loans [Line Items]      
Total Loans 2 93  
ASC 310-30 [Member] | Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 36,878 40,393  
Total Loans [Member]      
Loans [Line Items]      
Total Loans 4,246,941 4,092,308  
Total Loans [Member] | Originated and acquired loans [Member]      
Loans [Line Items]      
Total Loans 4,183,414 4,021,429  
Total Loans [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]      
Loans [Line Items]      
Total Loans 2,019,886 1,931,147  
Total Loans [Member] | Originated and acquired loans [Member] | Food and Agriculture [Member]      
Loans [Line Items]      
Total Loans 233,028 222,156  
Total Loans [Member] | Originated and acquired loans [Member] | Energy Loans [Member]      
Loans [Line Items]      
Total Loans 55,368 49,204  
Total Loans [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 2,737,005 2,624,173  
Total Loans [Member] | Originated and acquired loans [Member] | Total Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 609,076 551,819  
Total Loans [Member] | Originated and acquired loans [Member] | Commercial Construction [Member]      
Loans [Line Items]      
Total Loans 94,330 94,854  
Total Loans [Member] | Originated and acquired loans [Member] | Commercial Acquisition/Development [Member]      
Loans [Line Items]      
Total Loans 18,368 19,650  
Total Loans [Member] | Originated and acquired loans [Member] | Multifamily [Member]      
Loans [Line Items]      
Total Loans 60,635 56,685  
Total Loans [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]      
Loans [Line Items]      
Total Loans 428,723 421,666  
Total Loans [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]      
Loans [Line Items]      
Total Loans 435,743 380,630  
Total Loans [Member] | Originated and acquired loans [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 815,144 820,820  
Total Loans [Member] | Originated and acquired loans [Member] | Senior lien      
Loans [Line Items]      
Total Loans 717,419 723,036  
Total Loans [Member] | Originated and acquired loans [Member] | Junior lien      
Loans [Line Items]      
Total Loans 97,725 97,784  
Total Loans [Member] | Originated and acquired loans [Member] | Consumer [Member]      
Loans [Line Items]      
Total Loans 22,189 24,617  
Total Loans [Member] | ASC 310-30 [Member]      
Loans [Line Items]      
Total Loans 63,527 70,879  
Total Loans [Member] | ASC 310-30 [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 19,139 20,398  
Total Loans [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 7,508 9,990  
Total Loans [Member] | ASC 310-30 [Member] | Consumer [Member]      
Loans [Line Items]      
Total Loans 2 98  
Total Loans [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 36,878 40,393  
Total Loans [Member] | Pass [Member]      
Loans [Line Items]      
Total Loans 4,132,532 3,973,689  
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member]      
Loans [Line Items]      
Total Loans 4,074,996 3,909,304  
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]      
Loans [Line Items]      
Total Loans 1,980,564 1,890,710  
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Food and Agriculture [Member]      
Loans [Line Items]      
Total Loans 230,558 220,004  
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Energy Loans [Member]      
Loans [Line Items]      
Total Loans 54,564 48,462  
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 2,662,926 2,552,580  
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Total Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 589,316 524,721  
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Commercial Construction [Member]      
Loans [Line Items]      
Total Loans 92,690 92,731  
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Commercial Acquisition/Development [Member]      
Loans [Line Items]      
Total Loans 17,486 19,529  
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Multifamily [Member]      
Loans [Line Items]      
Total Loans 60,119 56,685  
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]      
Loans [Line Items]      
Total Loans 397,240 393,404  
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]      
Loans [Line Items]      
Total Loans 419,021 355,776  
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 800,646 807,428  
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Senior lien      
Loans [Line Items]      
Total Loans 704,303 710,972  
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Junior lien      
Loans [Line Items]      
Total Loans 96,343 96,456  
Total Loans [Member] | Pass [Member] | Originated and acquired loans [Member] | Consumer [Member]      
Loans [Line Items]      
Total Loans 22,108 24,575  
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member]      
Loans [Line Items]      
Total Loans 57,536 64,385  
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 16,452 17,579  
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 5,243 7,484  
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Consumer [Member]      
Loans [Line Items]      
Total Loans 2    
Total Loans [Member] | Pass [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 35,839 39,322  
Total Loans [Member] | Special Mention [Member]      
Loans [Line Items]      
Total Loans 62,530 63,975  
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member]      
Loans [Line Items]      
Total Loans 60,921 62,284  
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]      
Loans [Line Items]      
Total Loans 19,051 16,531  
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Food and Agriculture [Member]      
Loans [Line Items]      
Total Loans 1,220 1,260  
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 40,212 34,140  
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Total Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 16,837 24,158  
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Commercial Construction [Member]      
Loans [Line Items]      
Total Loans 432 915  
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Commercial Acquisition/Development [Member]      
Loans [Line Items]      
Total Loans 767    
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Multifamily [Member]      
Loans [Line Items]      
Total Loans 516    
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]      
Loans [Line Items]      
Total Loans 19,941 16,349  
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]      
Loans [Line Items]      
Total Loans 15,122 23,243  
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 3,872 3,986  
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Senior lien      
Loans [Line Items]      
Total Loans 3,455 3,571  
Total Loans [Member] | Special Mention [Member] | Originated and acquired loans [Member] | Junior lien      
Loans [Line Items]      
Total Loans 417 415  
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member]      
Loans [Line Items]      
Total Loans 1,609 1,691  
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 518 537  
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 849 908  
Total Loans [Member] | Special Mention [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 242 246  
Total Loans [Member] | Substandard [Member]      
Loans [Line Items]      
Total Loans 50,388 53,527  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member]      
Loans [Line Items]      
Total Loans 46,006 48,724  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]      
Loans [Line Items]      
Total Loans 18,934 22,919  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Food and Agriculture [Member]      
Loans [Line Items]      
Total Loans 1,218 847  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Energy Loans [Member]      
Loans [Line Items]      
Total Loans 804 742  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 32,413 36,336  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Total Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 2,886 2,940  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Commercial Construction [Member]      
Loans [Line Items]      
Total Loans 1,208 1,208  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Commercial Acquisition/Development [Member]      
Loans [Line Items]      
Total Loans 115 121  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]      
Loans [Line Items]      
Total Loans 11,457 11,828  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]      
Loans [Line Items]      
Total Loans 1,563 1,611  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 10,626 9,406  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Senior lien      
Loans [Line Items]      
Total Loans 9,661 8,493  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Junior lien      
Loans [Line Items]      
Total Loans 965 913  
Total Loans [Member] | Substandard [Member] | Originated and acquired loans [Member] | Consumer [Member]      
Loans [Line Items]      
Total Loans 81 42  
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member]      
Loans [Line Items]      
Total Loans 4,382 4,803  
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 2,169 2,282  
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Residential Real Estate Segment [Member]      
Loans [Line Items]      
Total Loans 1,416 1,598  
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Consumer [Member]      
Loans [Line Items]      
Total Loans   98  
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 797 825  
Total Loans [Member] | Doubtful [Member]      
Loans [Line Items]      
Total Loans 1,491 1,117  
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member]      
Loans [Line Items]      
Total Loans 1,491 1,117  
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Commercial and Industrial [Member]      
Loans [Line Items]      
Total Loans 1,337 987  
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Food and Agriculture [Member]      
Loans [Line Items]      
Total Loans 32 45  
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Commercial Loan [Member]      
Loans [Line Items]      
Total Loans 1,454 1,117  
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Total Commercial Real Estate [Member]      
Loans [Line Items]      
Total Loans 37    
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Owner-Occupied [Member]      
Loans [Line Items]      
Total Loans 85 $ 85  
Total Loans [Member] | Doubtful [Member] | Originated and acquired loans [Member] | Non Owner-Occupied [Member]      
Loans [Line Items]      
Total Loans $ 37