v3.26.1
Debt - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2026
Apr. 01, 2026
Jan. 13, 2022
Jun. 30, 2026
Aug. 31, 2020
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Debt Conversion [Line Items]                
Total borrowing capacity with the FHLB $ 4,483,049,000     $ 4,483,049,000   $ 4,483,049,000   $ 1,491,095,000
Additional borrowing availability with the FHLB 4,286,511,000     4,286,511,000   4,286,511,000    
Loans pledged to the FHLB 7,773,549,000     7,773,549,000   7,773,549,000   $ 2,761,116,000
Accretion of issuance costs and net discount on subordinated debt           1,017,000 $ 224,000  
Trust preferred securities, aggregate liquidation valuation amount 419,000     419,000   419,000    
Trust Preferred Securities | New Mexico Banquest Capital Trust I (NMBCT I)                
Debt Conversion [Line Items]                
Debt instrument, face amount 9,279,000     9,279,000   9,279,000    
Trust Preferred Securities | New Mexico Banquest Capital Trust II (NMBCT II)                
Debt Conversion [Line Items]                
Debt instrument, face amount $ 4,640,000     $ 4,640,000   $ 4,640,000    
LIBOR | Trust Preferred Securities | New Mexico Banquest Capital Trust I (NMBCT I)                
Debt Conversion [Line Items]                
Interest rate margin on variable rate basis           3.35%    
Rate 7.34%     7.34%   7.34% 7.91%  
LIBOR | Trust Preferred Securities | New Mexico Banquest Capital Trust II (NMBCT II)                
Debt Conversion [Line Items]                
Interest rate margin on variable rate basis           2.00%    
Rate 5.90%     5.90%   5.90% 6.59%  
Line of Credit | Other Financial Institutions                
Debt Conversion [Line Items]                
Line of credit facility, maximum borrowing capacity $ 250,000,000     $ 250,000,000   $ 250,000,000    
Line of credit outstanding 0     0   0    
Line of Credit | Federal Reserve Bank stock                
Debt Conversion [Line Items]                
Line of credit facility, maximum borrowing capacity 2,124,449,000     2,124,449,000   2,124,449,000    
Debt collateral amount 2,556,273,000     2,556,273,000   2,556,273,000    
Line of credit outstanding 0     0   $ 0    
Line of Credit | Federal Reserve Bank stock | Fed Funds target rate                
Debt Conversion [Line Items]                
Interest rate margin on variable rate basis           0.50%    
Fixed rate term advance | Federal Home Loan Bank stock                
Debt Conversion [Line Items]                
Federal Home Loan Bank advances $ 0     0   $ 0    
Subordinated Notes Due June 30, 2030 | Subordinated Debt                
Debt Conversion [Line Items]                
Interest rate margin on variable rate basis 9.60% 5.90%            
Debt instrument, face amount   $ 24,165,000            
Premium   $ 2,630,000            
Amortization of debt premium       143,000   143,000    
Subordinated Notes Due January 15, 2032 | Subordinated Debt                
Debt Conversion [Line Items]                
Interest rate margin on variable rate basis     2.03%          
Debt instrument, face amount     $ 25,000,000          
Debt instrument, interest rate     3.375%          
Debt redemption period from issuance date     5 years          
Costs related to the issuance of the subordinated notes     $ 534,000          
Accretion of issuance costs and net discount on subordinated debt     $ 0          
Subordinated Notes Due July 1, 2030 | Subordinated Debt                
Debt Conversion [Line Items]                
Interest rate margin on variable rate basis         2.04%      
Debt instrument, face amount         $ 150,000,000      
Debt instrument, interest rate         3.50%      
Costs related to the issuance of the subordinated notes         $ 9,236,000      
Accretion of issuance costs and net discount on subordinated debt       1,013,000   1,013,000    
Subordinated Debt related to Trust Preferred Securities | Subordinated Debt                
Debt Conversion [Line Items]                
Debt instrument, face amount $ 13,919,000     13,919,000   13,919,000    
Debt discount on the convertible notes $ 4,293,000     $ 4,293,000   $ 4,293,000