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Allowance for Credit Losses - Aggregated analysis of the changes in allowance for loan losses Details (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Allowance for loan losses:      
Balance at beginning of period $ 56,927 $ 55,798  
Charge-offs (3,223) (1,619)  
Recoveries 1,909 958  
Provision (benefit) 34,734 1,488  
Balance at end of period 144,785 56,522  
Loans individually evaluated for impairment 1,312    
Loans collectively evaluated for impairment $ 79,251    
Loans      
Total loans   11,146,122 $ 11,375,104
Real estate | Consumer      
Loans      
Total loans   3,523,157 3,464,980
Construction and land development      
Loans      
Total loans   946,503 1,017,261
Commercial non-owner occupied | Commercial loans      
Loans      
Total loans   2,329,449 2,323,967
Commercial owner occupied real estate loan | Commercial loans      
Loans      
Total loans   2,086,662 2,158,701
Consumer Owner Occupied Loans      
Loans      
Total loans   2,731,499 2,706,960
Home equity loans | Consumer      
Loans      
Total loans   791,658 758,020
Commercial and industrial | Commercial loans      
Loans      
Total loans   1,251,719 1,386,327
Other income producing property      
Loans      
Total loans   380,177 346,554
Consumer | Consumer      
Loans      
Total loans   610,231 663,422
Other loans | Commercial loans      
Loans      
Total loans   18,224 13,892
Non-acquired loans      
Allowance for loan losses:      
Balance at beginning of period   51,194  
Charge-offs   (1,245)  
Recoveries   752  
Provision (benefit)   1,307  
Balance at end of period   52,008  
Loans individually evaluated for impairment   1,599  
Loans collectively evaluated for impairment   50,409  
Loans      
Loans individually evaluated for impairment   56,273  
Loans collectively evaluated for impairment   8,254,340  
Total loans   8,310,613 9,252,831
Non-acquired loans | Commercial loans      
Loans      
Total loans   5,313,632 6,062,991
Non-acquired loans | Consumer      
Loans      
Total loans   2,996,981 3,189,840
Non-acquired loans | Real estate | Consumer      
Loans      
Total loans   2,513,640 2,637,467
Non-acquired loans | Construction and land development | Commercial loans      
Allowance for loan losses:      
Balance at beginning of period   5,682  
Recoveries   299  
Provision (benefit)   (610)  
Balance at end of period   5,371  
Loans individually evaluated for impairment   786  
Loans collectively evaluated for impairment   4,585  
Loans      
Loans individually evaluated for impairment   38,257  
Loans collectively evaluated for impairment   772,294  
Total loans   810,551 968,360
Non-acquired loans | Commercial non-owner occupied | Commercial loans      
Allowance for loan losses:      
Balance at beginning of period   8,754  
Recoveries   22  
Provision (benefit)   964  
Balance at end of period   9,740  
Loans individually evaluated for impairment   60  
Loans collectively evaluated for impairment   9,680  
Loans      
Loans individually evaluated for impairment   375  
Loans collectively evaluated for impairment   1,615,041  
Total loans   1,615,416 1,811,138
Non-acquired loans | Commercial owner occupied real estate loan | Commercial loans      
Allowance for loan losses:      
Balance at beginning of period   9,369  
Charge-offs   (12)  
Recoveries   25  
Provision (benefit)   247  
Balance at end of period   9,629  
Loans individually evaluated for impairment   21  
Loans collectively evaluated for impairment   9,608  
Loans      
Loans individually evaluated for impairment   4,220  
Loans collectively evaluated for impairment   1,597,140  
Total loans   1,601,360 1,784,017
Non-acquired loans | Consumer Owner Occupied Loans | Consumer      
Allowance for loan losses:      
Balance at beginning of period   11,913  
Charge-offs   (37)  
Recoveries   2  
Provision (benefit)   180  
Balance at end of period   12,058  
Loans individually evaluated for impairment   37  
Loans collectively evaluated for impairment   12,021  
Loans      
Loans individually evaluated for impairment   6,885  
Loans collectively evaluated for impairment   1,998,429  
Total loans   2,005,314 2,118,839
Non-acquired loans | Home equity loans | Consumer      
Allowance for loan losses:      
Balance at beginning of period   3,434  
Charge-offs   (15)  
Recoveries   36  
Provision (benefit)   (182)  
Balance at end of period   3,273  
Loans individually evaluated for impairment   161  
Loans collectively evaluated for impairment   3,112  
Loans      
Loans individually evaluated for impairment   2,754  
Loans collectively evaluated for impairment   505,572  
Total loans   508,326 518,628
Non-acquired loans | Commercial and industrial | Commercial loans      
Allowance for loan losses:      
Balance at beginning of period   7,454  
Charge-offs   (19)  
Recoveries   71  
Provision (benefit)   (257)  
Balance at end of period   7,249  
Loans individually evaluated for impairment   420  
Loans collectively evaluated for impairment   6,829  
Loans      
Loans individually evaluated for impairment   1,315  
Loans collectively evaluated for impairment   1,070,755  
Total loans   1,072,070 1,280,859
Non-acquired loans | Other income producing property      
Allowance for loan losses:      
Balance at beginning of period   1,446  
Recoveries   45  
Provision (benefit)   (104)  
Balance at end of period   1,387  
Loans individually evaluated for impairment   111  
Loans collectively evaluated for impairment   1,276  
Loans      
Loans individually evaluated for impairment   2,357  
Loans collectively evaluated for impairment   211,878  
Total loans   214,235 218,617
Non-acquired loans | Consumer | Consumer      
Allowance for loan losses:      
Balance at beginning of period   3,101  
Charge-offs   (1,162)  
Recoveries   252  
Provision (benefit)   1,004  
Balance at end of period   3,195  
Loans individually evaluated for impairment   3  
Loans collectively evaluated for impairment   3,192  
Loans      
Loans individually evaluated for impairment   110  
Loans collectively evaluated for impairment   465,007  
Total loans   465,117 538,481
Non-acquired loans | Other loans | Commercial loans      
Allowance for loan losses:      
Balance at beginning of period   41  
Provision (benefit)   65  
Balance at end of period   106  
Loans collectively evaluated for impairment   106  
Loans      
Loans collectively evaluated for impairment   18,224  
Total loans   18,224 13,892
Non-acquired loans | Other loans | Consumer      
Loans      
Total loans   18,224 13,892
Acquired non-credit impaired loans      
Allowance for loan losses:      
Charge-offs   (374)  
Recoveries   206  
Provision (benefit)   168  
Loans      
Loans collectively evaluated for impairment   2,378,737  
Total loans   2,378,737 1,760,427
Acquired non-credit impaired loans | Commercial loans      
Loans      
Total loans   1,438,160 985,780
Acquired non-credit impaired loans | Consumer      
Loans      
Total loans   940,577 774,647
Acquired non-credit impaired loans | Real estate | Consumer      
Loans      
Total loans   835,654 685,163
Acquired non-credit impaired loans | Construction and land development | Commercial loans      
Allowance for loan losses:      
Charge-offs   (6)  
Recoveries   1  
Provision (benefit)   5  
Loans      
Loans collectively evaluated for impairment   113,572  
Total loans   113,572 33,569
Acquired non-credit impaired loans | Commercial non-owner occupied | Commercial loans      
Loans      
Loans collectively evaluated for impairment   629,394  
Total loans   629,394 447,441
Acquired non-credit impaired loans | Commercial owner occupied real estate loan | Commercial loans      
Loans      
Loans collectively evaluated for impairment   400,658  
Total loans   400,658 307,193
Acquired non-credit impaired loans | Consumer Owner Occupied Loans | Consumer      
Allowance for loan losses:      
Recoveries   2  
Provision (benefit)   (2)  
Loans      
Loans collectively evaluated for impairment   610,376  
Total loans   610,376 496,431
Acquired non-credit impaired loans | Home equity loans | Consumer      
Allowance for loan losses:      
Charge-offs   (72)  
Recoveries   22  
Provision (benefit)   50  
Loans      
Loans collectively evaluated for impairment   225,278  
Total loans   225,278 188,732
Acquired non-credit impaired loans | Commercial and industrial | Commercial loans      
Allowance for loan losses:      
Charge-offs   (134)  
Recoveries   165  
Provision (benefit)   (31)  
Loans      
Loans collectively evaluated for impairment   173,840  
Total loans   173,840 101,880
Acquired non-credit impaired loans | Other income producing property      
Loans      
Total loans   120,696 95,697
Acquired non-credit impaired loans | Other income producing property | Commercial loans      
Allowance for loan losses:      
Charge-offs   (26)  
Provision (benefit)   26  
Loans      
Loans collectively evaluated for impairment   120,696  
Total loans   120,696 95,697
Acquired non-credit impaired loans | Consumer | Consumer      
Allowance for loan losses:      
Charge-offs   (136)  
Recoveries   16  
Provision (benefit)   120  
Loans      
Loans collectively evaluated for impairment   104,923  
Total loans   104,923 89,484
Acquired credit impaired loans      
Allowance for loan losses:      
Balance at beginning of period   4,604  
Provision (benefit)   13  
Reduction due to loan removals   (103)  
Balance at end of period   4,514  
Loans collectively evaluated for impairment   4,514  
Loans      
Loans collectively evaluated for impairment   456,772  
Total loans   456,772 361,846
Acquired credit impaired loans | Real estate | Commercial loans      
Allowance for loan losses:      
Balance at beginning of period   801  
Provision (benefit)   51  
Reduction due to loan removals   (5)  
Balance at end of period   847  
Loans collectively evaluated for impairment   847  
Loans      
Loans collectively evaluated for impairment   173,707  
Total loans   173,707 130,938
Acquired credit impaired loans | Real estate | Consumer      
Allowance for loan losses:      
Balance at beginning of period   2,246  
Provision (benefit)   16  
Reduction due to loan removals   (98)  
Balance at end of period   2,164  
Loans collectively evaluated for impairment   2,164  
Loans      
Loans collectively evaluated for impairment   199,701  
Total loans   199,701 163,359
Acquired credit impaired loans | Construction and land development | Commercial loans      
Allowance for loan losses:      
Balance at beginning of period   717  
Balance at end of period   717  
Loans collectively evaluated for impairment   717  
Loans      
Loans collectively evaluated for impairment   32,257  
Total loans   32,257 25,032
Acquired credit impaired loans | Commercial and industrial | Commercial loans      
Allowance for loan losses:      
Balance at beginning of period   79  
Balance at end of period   79  
Loans collectively evaluated for impairment   79  
Loans      
Loans collectively evaluated for impairment   10,925  
Total loans   10,925 7,029
Acquired credit impaired loans | Consumer | Consumer      
Allowance for loan losses:      
Balance at beginning of period   761  
Provision (benefit)   (54)  
Balance at end of period   707  
Loans collectively evaluated for impairment   707  
Loans      
Loans collectively evaluated for impairment   40,182  
Total loans   $ 40,182 $ 35,488