v3.26.1
BUSINESS SEGMENTS (Results of Operations and Selected Financial Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Segment Reporting Information [Line Items]      
Interest income $ 194,126 $ 189,222  
Interest expense (40,313) (40,151)  
Net interest income 153,813 149,071  
(Provision for) recapture of credit losses (22,483) (25,688)  
Non-interest income, net 32,167 29,517  
Non-interest expense:      
Compensation and employee benefits (41,347) (39,932)  
Occupancy, equipment and infrastructure costs (8,598) (9,734)  
Depreciation and amortization of premises and equipment (4,820) (5,086)  
Electronic banking charges (8,604) (9,670)  
Information technology expenses (6,597) (6,287)  
Professional and service fees (6,214) (5,118)  
Loan servicing and clearing expenses (2,564) (2,234)  
Amortization of other intangibles assets (231) (288)  
Intersegment expenses 0 0  
Other (15,728) (15,103)  
Total non-interest expense (94,703) (93,452)  
Income before income taxes 68,794 59,448  
Income tax expense (14,857) (13,876)  
Net income 53,937 45,572  
Total assets 12,047,903 11,729,257 $ 12,465,657
Expenditures for long-lived assets 4,356 4,350  
Total      
Segment Reporting Information [Line Items]      
Interest income 195,452 190,465  
Interest expense (41,639) (41,394)  
Net interest income 153,813 149,071  
(Provision for) recapture of credit losses (22,483) (25,688)  
Non-interest income, net 32,167 29,517  
Non-interest expense:      
Compensation and employee benefits (41,347) (39,932)  
Occupancy, equipment and infrastructure costs (8,598) (9,734)  
Depreciation and amortization of premises and equipment (4,820) (5,086)  
Electronic banking charges (8,604) (9,670)  
Information technology expenses (6,597) (6,287)  
Professional and service fees (6,214) (5,118)  
Loan servicing and clearing expenses (2,564) (2,234)  
Amortization of other intangibles assets (231) (288)  
Intersegment expenses 0 0  
Other (15,728) (15,103)  
Total non-interest expense (94,703) (93,452)  
Income before income taxes 68,794 59,448  
Income tax expense (14,857) (13,876)  
Net income 53,937 45,572  
Total assets 13,408,500 12,956,296  
Expenditures for long-lived assets 4,356 4,350  
Total | Banking      
Segment Reporting Information [Line Items]      
Interest income 159,778 155,027  
Interest expense (31,048) (34,530)  
Net interest income 128,730 120,497  
(Provision for) recapture of credit losses (22,479) (25,690)  
Non-interest income, net 23,023 20,700  
Non-interest expense:      
Compensation and employee benefits (38,460) (36,786)  
Occupancy, equipment and infrastructure costs (8,460) (9,540)  
Depreciation and amortization of premises and equipment (4,799) (5,068)  
Electronic banking charges (8,604) (9,670)  
Information technology expenses (6,560) (6,238)  
Professional and service fees (4,332) (4,423)  
Loan servicing and clearing expenses (1,856) (1,576)  
Amortization of other intangibles assets (231) (288)  
Intersegment expenses 1,034 830  
Other (15,088) (14,600)  
Total non-interest expense (87,356) (87,359)  
Income before income taxes 41,918 28,148  
Income tax expense (14,804) (13,808)  
Net income 27,114 14,340  
Total assets 10,045,598 9,567,669  
Expenditures for long-lived assets 4,356 4,349  
Total | Wealth Management      
Segment Reporting Information [Line Items]      
Interest income 5 5  
Interest expense 0 0  
Net interest income 5 5  
(Provision for) recapture of credit losses 0 0  
Non-interest income, net 9,144 8,817  
Non-interest expense:      
Compensation and employee benefits (2,565) (2,871)  
Occupancy, equipment and infrastructure costs (124) (178)  
Depreciation and amortization of premises and equipment (10) (13)  
Electronic banking charges 0 0  
Information technology expenses (37) (55)  
Professional and service fees (719) (642)  
Loan servicing and clearing expenses (573) (590)  
Amortization of other intangibles assets 0 0  
Intersegment expenses (585) (520)  
Other (478) (373)  
Total non-interest expense (5,091) (5,242)  
Income before income taxes 4,058 3,580  
Income tax expense 0 (17)  
Net income 4,058 3,563  
Total assets 33,939 37,647  
Expenditures for long-lived assets 0 1  
Total | Treasury      
Segment Reporting Information [Line Items]      
Interest income 35,669 35,433  
Interest expense (10,591) (6,864)  
Net interest income 25,078 28,569  
(Provision for) recapture of credit losses (4) 2  
Non-interest income, net 0 0  
Non-interest expense:      
Compensation and employee benefits (322) (275)  
Occupancy, equipment and infrastructure costs (14) (16)  
Depreciation and amortization of premises and equipment (11) (5)  
Electronic banking charges 0 0  
Information technology expenses 0 6  
Professional and service fees (1,163) (53)  
Loan servicing and clearing expenses (135) (68)  
Amortization of other intangibles assets 0 0  
Intersegment expenses (449) (310)  
Other (162) (130)  
Total non-interest expense (2,256) (851)  
Income before income taxes 22,818 27,720  
Income tax expense (53) (51)  
Net income 22,765 27,669  
Total assets 3,328,963 3,350,980  
Expenditures for long-lived assets 0 0  
Eliminations      
Segment Reporting Information [Line Items]      
Interest income (1,326) (1,243)  
Interest expense 1,326 1,243  
Net interest income 0 0  
(Provision for) recapture of credit losses 0 0  
Non-interest income, net 0 0  
Non-interest expense:      
Compensation and employee benefits 0 0  
Occupancy, equipment and infrastructure costs 0 0  
Depreciation and amortization of premises and equipment 0 0  
Electronic banking charges 0 0  
Information technology expenses 0 0  
Professional and service fees 0 0  
Loan servicing and clearing expenses 0 0  
Amortization of other intangibles assets 0 0  
Intersegment expenses 0 0  
Other 0 0  
Total non-interest expense 0 0  
Income before income taxes 0 0  
Income tax expense 0 0  
Net income 0 0  
Total assets (1,360,597) (1,227,039)  
Expenditures for long-lived assets $ 0 $ 0