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Allowance for Credit Losses and Allowance for Unfunded Commitments and Letters of Credit (Analysis of Credit Quality of the Loan Portfolio) (Details) - USD ($)
Sep. 30, 2020
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year $ 2,017,963,000     $ 1,594,130,000      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,494,480,000     1,280,086,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,076,250,000     1,125,520,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 938,911,000     1,023,452,000      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 871,129,000     687,055,000      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,560,910,000     1,241,613,000      
Financing Receivable, Revolving 1,696,730,000     1,713,819,000      
Financing Receivable, Revolving Converted to Term Loans 32,574,000     77,790,000      
Loans and Leases Receivable, Net of Deferred Income 9,688,947,000     8,743,465,000      
Financing Receivable, Allowance for Credit Loss 156,968,000 $ 151,546,000 $ 85,600,000 83,968,000 $ 82,660,000 $ 80,517,000 $ 83,369,000
Loans, net 9,531,979,000     8,659,497,000      
Commercial Real Estate [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 500,342,000     701,207,000      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 706,003,000     573,995,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 536,224,000     637,452,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 570,238,000     605,517,000      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 527,692,000     461,498,000      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,126,237,000     888,851,000      
Financing Receivable, Revolving 56,747,000     52,276,000      
Financing Receivable, Revolving Converted to Term Loans 3,552,000     25,057,000      
Loans and Leases Receivable, Net of Deferred Income 4,027,035,000     3,945,853,000      
Financing Receivable, Allowance for Credit Loss 61,324,000 50,233,000 27,873,000 20,340,000 17,922,000 15,648,000 14,766,000
Commercial Real Estate [Member] | Pass [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 491,625,000     699,336,000      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 636,127,000     562,992,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 499,924,000     621,113,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 542,049,000     565,928,000      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 434,390,000     441,220,000      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,032,016,000     873,687,000      
Financing Receivable, Revolving 48,664,000     52,276,000      
Financing Receivable, Revolving Converted to Term Loans 3,552,000     19,986,000      
Loans and Leases Receivable, Net of Deferred Income 3,688,347,000     3,836,538,000      
Commercial Real Estate [Member] | Special Mention [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 8,717,000     1,824,000      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 59,899,000     305,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 18,993,000     7,019,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 15,175,000     3,360,000      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 47,881,000     0      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 50,571,000     3,426,000      
Financing Receivable, Revolving 2,148,000     0      
Financing Receivable, Revolving Converted to Term Loans 0     0      
Loans and Leases Receivable, Net of Deferred Income 203,384,000     15,934,000      
Commercial Real Estate [Member] | Substandard [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 0     47,000      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 9,977,000     10,698,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 17,307,000     9,320,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 13,014,000     36,229,000      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 45,421,000     20,278,000      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 43,650,000     11,738,000      
Financing Receivable, Revolving 5,935,000     0      
Financing Receivable, Revolving Converted to Term Loans 0     5,071,000      
Loans and Leases Receivable, Net of Deferred Income 135,304,000     93,381,000      
Commercial Business [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 1,184,234,000     481,807,000      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 466,968,000     466,135,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 383,521,000     334,448,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 264,499,000     312,877,000      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 254,315,000     160,715,000      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 274,454,000     203,646,000      
Financing Receivable, Revolving 995,843,000     1,003,012,000      
Financing Receivable, Revolving Converted to Term Loans 12,175,000     26,973,000      
Loans and Leases Receivable, Net of Deferred Income 3,836,009,000     2,989,613,000      
Financing Receivable, Allowance for Credit Loss 50,572,000 53,186,000 31,054,000 30,292,000 30,879,000 29,700,000 34,658,000
Commercial Business [Member] | Pass [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 1,175,587,000     479,481,000      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 409,759,000     442,222,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 357,128,000     330,934,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 233,037,000     301,337,000      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 240,648,000     157,436,000      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 256,178,000     199,089,000      
Financing Receivable, Revolving 915,373,000     963,663,000      
Financing Receivable, Revolving Converted to Term Loans 8,674,000     25,577,000      
Loans and Leases Receivable, Net of Deferred Income 3,596,384,000     2,899,739,000      
Commercial Business [Member] | Special Mention [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 4,856,000     2,241,000      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 51,204,000     6,673,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 8,635,000     56,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 25,626,000     2,006,000      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 6,514,000     52,000      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 11,907,000     585,000      
Financing Receivable, Revolving 35,819,000     12,710,000      
Financing Receivable, Revolving Converted to Term Loans 0     0      
Loans and Leases Receivable, Net of Deferred Income 144,561,000     24,323,000      
Commercial Business [Member] | Substandard [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 3,791,000     85,000      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 6,005,000     17,240,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 17,758,000     3,458,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 5,836,000     9,534,000      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 7,153,000     3,227,000      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 6,369,000     3,972,000      
Financing Receivable, Revolving 44,651,000     26,639,000      
Financing Receivable, Revolving Converted to Term Loans 3,501,000     1,396,000      
Loans and Leases Receivable, Net of Deferred Income 95,064,000     65,551,000      
Agriculture [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 150,568,000     115,000,000      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 113,012,000     63,532,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 49,414,000     77,891,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 64,139,000     77,781,000      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 62,678,000     35,138,000      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 67,011,000     62,616,000      
Financing Receivable, Revolving 330,705,000     316,989,000      
Financing Receivable, Revolving Converted to Term Loans 12,763,000     16,424,000      
Loans and Leases Receivable, Net of Deferred Income 850,290,000     765,371,000      
Financing Receivable, Allowance for Credit Loss 12,461,000 14,868,000 6,510,000 15,835,000 13,899,000 12,671,000 9,589,000
Agriculture [Member] | Pass [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 147,892,000     107,152,000      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 99,483,000     54,950,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 42,464,000     70,337,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 59,828,000     71,874,000      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 60,007,000     33,597,000      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 62,529,000     56,342,000      
Financing Receivable, Revolving 290,986,000     280,984,000      
Financing Receivable, Revolving Converted to Term Loans 12,273,000     10,036,000      
Loans and Leases Receivable, Net of Deferred Income 775,462,000     685,272,000      
Agriculture [Member] | Special Mention [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 0     557,000      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 519,000     2,535,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 0     1,381,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 33,000     0      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 272,000     64,000      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 0     576,000      
Financing Receivable, Revolving 1,801,000     5,336,000      
Financing Receivable, Revolving Converted to Term Loans 0     0      
Loans and Leases Receivable, Net of Deferred Income 2,625,000     10,449,000      
Agriculture [Member] | Substandard [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 2,676,000     7,291,000      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 13,010,000     6,047,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 6,950,000     6,173,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 4,278,000     5,907,000      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 2,399,000     1,477,000      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 4,482,000     5,698,000      
Financing Receivable, Revolving 37,918,000     30,669,000      
Financing Receivable, Revolving Converted to Term Loans 490,000     6,388,000      
Loans and Leases Receivable, Net of Deferred Income 72,203,000     69,650,000      
Construction [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 89,744,000     183,525,000      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 120,941,000     92,606,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 29,669,000     40,514,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 4,531,000     1,067,000      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 782,000     939,000      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,940,000     1,660,000      
Financing Receivable, Revolving 25,569,000     33,429,000      
Financing Receivable, Revolving Converted to Term Loans 0     7,793,000      
Loans and Leases Receivable, Net of Deferred Income 273,176,000     361,533,000      
Financing Receivable, Allowance for Credit Loss 8,963,000 7,953,000 6,821,000 8,571,000 11,852,000 12,457,000 14,395,000
Construction [Member] | Pass [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 89,744,000     183,525,000      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 101,060,000     91,342,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 24,130,000     40,514,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 4,531,000     1,067,000      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 782,000     939,000      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,883,000     1,601,000      
Financing Receivable, Revolving 25,536,000     33,388,000      
Financing Receivable, Revolving Converted to Term Loans 0     7,793,000      
Loans and Leases Receivable, Net of Deferred Income 247,666,000     360,169,000      
Construction [Member] | Special Mention [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 0     0      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 2,259,000     1,264,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 0     0      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 0     0      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 0     0      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 0     0      
Financing Receivable, Revolving 0     41,000      
Financing Receivable, Revolving Converted to Term Loans 0     0      
Loans and Leases Receivable, Net of Deferred Income 2,259,000     1,305,000      
Construction [Member] | Substandard [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 0     0      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 17,622,000     0      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 5,539,000     0      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 0     0      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 0     0      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 57,000     59,000      
Financing Receivable, Revolving 33,000     0      
Financing Receivable, Revolving Converted to Term Loans 0     0      
Loans and Leases Receivable, Net of Deferred Income 23,251,000     59,000      
One-to-Four Family Residential [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 88,632,000     103,315,000      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 83,872,000     78,105,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 73,123,000     33,240,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 34,326,000     25,452,000      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 25,331,000     27,917,000      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 89,936,000     83,526,000      
Financing Receivable, Revolving 266,905,000     284,735,000      
Financing Receivable, Revolving Converted to Term Loans 3,307,000     1,035,000      
Loans and Leases Receivable, Net of Deferred Income 665,432,000     637,325,000      
Financing Receivable, Allowance for Credit Loss 22,107,000 23,711,000 11,672,000 7,435,000 7,458,000 7,619,000 8,024,000
One-to-Four Family Residential [Member] | Pass [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 88,632,000     103,315,000      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 83,137,000     77,877,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 72,896,000     32,440,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 33,149,000     25,052,000      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 24,987,000     27,294,000      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 87,267,000     80,370,000      
Financing Receivable, Revolving 265,475,000     283,830,000      
Financing Receivable, Revolving Converted to Term Loans 3,110,000     554,000      
Loans and Leases Receivable, Net of Deferred Income 658,653,000     630,732,000      
One-to-Four Family Residential [Member] | Special Mention [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 0            
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 0            
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 0            
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 0            
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 0            
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 206,000            
Financing Receivable, Revolving 297,000            
Financing Receivable, Revolving Converted to Term Loans 0            
Loans and Leases Receivable, Net of Deferred Income 503,000            
One-to-Four Family Residential [Member] | Substandard [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 0     0      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 735,000     228,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 227,000     800,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,177,000     400,000      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 344,000     623,000      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 2,463,000     3,156,000      
Financing Receivable, Revolving 1,133,000     905,000      
Financing Receivable, Revolving Converted to Term Loans 197,000     481,000      
Loans and Leases Receivable, Net of Deferred Income 6,276,000     6,593,000      
Consumer Loan [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 4,443,000     9,276,000      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 3,684,000     5,713,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 4,299,000     1,975,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,178,000     758,000      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 331,000     848,000      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,332,000     1,314,000      
Financing Receivable, Revolving 20,961,000     23,378,000      
Financing Receivable, Revolving Converted to Term Loans 777,000     508,000      
Loans and Leases Receivable, Net of Deferred Income 37,005,000     43,770,000      
Financing Receivable, Allowance for Credit Loss 1,541,000 $ 1,595,000 $ 1,661,000 883,000 $ 579,000 $ 715,000 $ 787,000
Consumer Loan [Member] | Pass [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 4,412,000     9,276,000      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 3,684,000     5,713,000      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 4,299,000     1,974,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,172,000     758,000      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 327,000     848,000      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,161,000     1,306,000      
Financing Receivable, Revolving 20,937,000     23,351,000      
Financing Receivable, Revolving Converted to Term Loans 736,000     508,000      
Loans and Leases Receivable, Net of Deferred Income 36,728,000     43,734,000      
Consumer Loan [Member] | Substandard [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing Receivable, Year One, Originated, Current Fiscal Year 31,000     0      
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 0     0      
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 0     1,000      
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 6,000     0      
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 4,000     0      
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 171,000     8,000      
Financing Receivable, Revolving 24,000     27,000      
Financing Receivable, Revolving Converted to Term Loans 41,000     0      
Loans and Leases Receivable, Net of Deferred Income $ 277,000     $ 36,000