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Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment $ 19,826,731 $ 19,805,403    
Non-Graded, Recorded Investment 1,924,256 1,851,327    
Total 21,750,987 21,656,730    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 179,129 171,272    
Non-Graded, Related Allowance 14,435 18,417    
Total, Related Allowance 210,759 207,457 $ 230,682 $ 246,159
Commercial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 13,997,538 13,586,654    
Non-Graded, Recorded Investment 34,112 49,424    
Total 14,031,650 13,636,078    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 117,236 101,303    
Non-Graded, Related Allowance 951 923    
Total, Related Allowance 118,187 102,226 124,269 140,213
Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Total 3,973,377 3,590,333    
Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Total 3,122,163 3,258,192    
Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Total 1,760,866 1,621,158    
Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Total 665,449 730,521    
Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Total 3,033,916 2,799,277    
Commercial [Member] | Public finance [Member]        
Recorded Investment [Abstract]        
Total 709,868 804,550    
Commercial [Member] | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Total 766,011 832,047    
Commercial Real Estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 4,433,783 4,764,813    
Non-Graded, Recorded Investment 0 0    
Total 4,433,783 4,764,813    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 51,805 60,026    
Non-Graded, Related Allowance 0 0    
Total, Related Allowance 51,805 60,026 56,621 50,749
Commercial Real Estate [Member] | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Total 150,879 148,584    
Commercial Real Estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Total 775,521 919,082    
Commercial Real Estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Total 928,379 1,072,920    
Commercial Real Estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Total 1,265,562 1,288,065    
Commercial Real Estate [Member] | Industrial [Member]        
Recorded Investment [Abstract]        
Total 856,117 778,106    
Commercial Real Estate [Member] | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Total 457,325 558,056    
Residential Mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 279,113 505,046    
Non-Graded, Recorded Investment 1,805,059 1,724,987    
Total 2,084,172 2,230,033    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 3,085 3,310    
Non-Graded, Related Allowance 11,315 14,654    
Total, Related Allowance 14,400 17,964 18,451 18,224
Residential Mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Total 1,057,321 1,122,610    
Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]        
Recorded Investment [Abstract]        
Total 197,794 190,866    
Residential Mortgage [Member] | Home equity [Member]        
Recorded Investment [Abstract]        
Total 829,057 916,557    
Personal [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,116,297 948,890    
Non-Graded, Recorded Investment 85,085 76,916    
Total 1,201,382 1,025,806    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 7,003 6,633    
Non-Graded, Related Allowance 2,169 2,840    
Total, Related Allowance 9,172 9,473 9,124 8,773
Specific Allowance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 19,826,731 19,805,403    
Non-Graded, Recorded Investment 1,924,256 1,851,327    
Total 21,750,987 21,656,730    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 179,129 171,272    
Non-Graded, Related Allowance 14,435 18,417    
Total, Related Allowance 193,564 189,689    
Nonspecific Allowance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Non-Graded, Recorded Investment 0 0    
Total 0 0    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 0 0    
Non-Graded, Related Allowance 0 0    
Total, Related Allowance 17,195 17,768 $ 22,217 $ 28,200
Performing Financial Instruments [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 1,886,858 1,811,557    
Performing Financial Instruments [Member] | Commercial [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 34,075 49,371    
Performing Financial Instruments [Member] | Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial [Member] | Public finance [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial [Member] | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 34,075 49,371    
Performing Financial Instruments [Member] | Commercial Real Estate [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial Real Estate [Member] | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial Real Estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial Real Estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial Real Estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial Real Estate [Member] | Industrial [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Commercial Real Estate [Member] | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Residential Mortgage [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 1,767,930 1,685,424    
Performing Financial Instruments [Member] | Residential Mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 758,260 819,199    
Performing Financial Instruments [Member] | Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 191,694 183,734    
Performing Financial Instruments [Member] | Residential Mortgage [Member] | Home equity [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 817,976 682,491    
Performing Financial Instruments [Member] | Personal [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 84,853 76,762    
Performing Financial Instruments [Member] | Pass [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 19,312,702 19,285,126    
Performing Financial Instruments [Member] | Pass [Member] | Commercial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 13,538,705 13,135,068    
Performing Financial Instruments [Member] | Pass [Member] | Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,700,406 3,414,039    
Performing Financial Instruments [Member] | Pass [Member] | Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,050,946 3,167,203    
Performing Financial Instruments [Member] | Pass [Member] | Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,749,023 1,593,902    
Performing Financial Instruments [Member] | Pass [Member] | Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 623,219 668,438    
Performing Financial Instruments [Member] | Pass [Member] | Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,995,514 2,730,121    
Performing Financial Instruments [Member] | Pass [Member] | Commercial [Member] | Public finance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 709,868 804,550    
Performing Financial Instruments [Member] | Pass [Member] | Commercial [Member] | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 709,729 756,815    
Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 4,381,663 4,712,826    
Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate [Member] | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 150,529 148,234    
Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 743,343 885,588    
Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 923,202 1,059,334    
Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,257,005 1,287,471    
Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate [Member] | Industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 852,539 776,898    
Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate [Member] | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 455,045 555,301    
Performing Financial Instruments [Member] | Pass [Member] | Residential Mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 276,138 492,976    
Performing Financial Instruments [Member] | Pass [Member] | Residential Mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 276,138 269,678    
Performing Financial Instruments [Member] | Pass [Member] | Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Pass [Member] | Residential Mortgage [Member] | Home equity [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 223,298    
Performing Financial Instruments [Member] | Pass [Member] | Personal [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,116,196 944,256    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 210,149 181,960    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 187,881 157,866    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 117,298 42,176    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 29,943 49,761    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 5,281 18,809    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 18,214 30,934    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 13,117 14,920    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Public finance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial [Member] | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 4,028 1,266    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial Real Estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 22,145 23,927    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial Real Estate [Member] | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial Real Estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 12,067 11,926    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial Real Estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 5,177 10,532    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial Real Estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,604 281    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial Real Estate [Member] | Industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,658 0    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Commercial Real Estate [Member] | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,639 1,188    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Residential Mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 78 52    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Residential Mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 78 52    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Residential Mortgage [Member] | Home equity [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Other Loans Especially Mentioned [Member] | Personal [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 45 115    
Performing Financial Instruments [Member] | Substandard [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 160,326 214,840    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 155,573 193,932    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 63,951 86,624    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 33,791 32,661    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 5,399 7,131    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 13,883 22,230    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 20,805 37,698    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial [Member] | Public finance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial [Member] | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 17,744 7,588    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,349 6,439    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate [Member] | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,243 1,289    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 3,054    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 95 12    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate [Member] | Industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,011 1,208    
Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate [Member] | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 876    
Performing Financial Instruments [Member] | Substandard [Member] | Residential Mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,404 10,026    
Performing Financial Instruments [Member] | Substandard [Member] | Residential Mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,404 9,730    
Performing Financial Instruments [Member] | Substandard [Member] | Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Performing Financial Instruments [Member] | Substandard [Member] | Residential Mortgage [Member] | Home equity [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 296    
Performing Financial Instruments [Member] | Substandard [Member] | Personal [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 4,443    
Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 143,554 123,476    
Non-Graded, Recorded Investment 37,398 39,771    
Nonaccrual [Member] | Commercial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 115,379 99,788    
Non-Graded, Recorded Investment 37 53    
Nonaccrual [Member] | Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 91,722 47,494    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 7,483 8,567    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,163 1,316    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 10,133 8,919    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 4,480 16,538    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial [Member] | Public finance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial [Member] | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 398 16,954    
Non-Graded, Recorded Investment 37 53    
Nonaccrual [Member] | Commercial Real Estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 27,626 21,621    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial Real Estate [Member] | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 350 350    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial Real Estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 18,868 20,279    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial Real Estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial Real Estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 6,858 301    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial Real Estate [Member] | Industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 909 0    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Commercial Real Estate [Member] | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 641 691    
Non-Graded, Recorded Investment 0 0    
Nonaccrual [Member] | Residential Mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 493 1,991    
Non-Graded, Recorded Investment 37,129 39,564    
Nonaccrual [Member] | Residential Mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 493 1,991    
Non-Graded, Recorded Investment 19,948 21,960    
Nonaccrual [Member] | Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Non-Graded, Recorded Investment 6,100 7,132    
Nonaccrual [Member] | Residential Mortgage [Member] | Home equity [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Non-Graded, Recorded Investment 11,081 10,472    
Nonaccrual [Member] | Personal [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 56 76    
Non-Graded, Recorded Investment 232 154    
Residential Mortgage [Member] | Performing Financial Instruments [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 192,000 184,000    
Residential Mortgage [Member] | Nonaccrual [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment $ 6,100 $ 7,100