v3.26.1
BUSINESS SEGMENTS (Results of Operations and Selected Financial Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]          
Interest income $ 197,150 $ 194,347 $ 391,276 $ 383,569  
Interest expense (39,851) (42,419) (80,164) (82,570)  
Net interest income 157,299 151,928 311,112 300,999  
(Provision for) recapture of credit losses (13,006) (21,678) (35,489) (47,366)  
Non-interest income, net 33,023 30,431 65,190 59,948  
Non-interest expense:          
Compensation and employee benefits (41,176) (39,565) (82,523) (79,497)  
Occupancy, equipment and infrastructure costs (9,416) (9,544) (18,014) (19,278)  
Depreciation and amortization of premises and equipment (4,857) (5,085) (9,677) (10,171)  
Electronic banking charges (12,229) (12,276) (20,834) (21,946)  
Information technology expenses (7,117) (6,678) (13,714) (12,966)  
Professional and service fees (4,839) (4,813) (11,053) (9,931)  
Loan servicing and clearing expenses (2,497) (2,172) (5,061) (4,406)  
Amortization of other intangibles assets (231) (289) (462) (577)  
Intersegment expenses 0 0 0 0  
Other (20,470) (14,380) (36,197) (29,482)  
Total non-interest expense (102,832) (94,802) (197,535) (188,254)  
Income before income taxes 74,484 65,879 143,278 125,327  
Income tax expense (15,707) (14,078) (30,564) (27,954)  
Net income 58,777 51,801 112,714 97,373  
Total assets 12,154,572 12,231,510 12,154,572 12,231,510 $ 12,465,657
Expenditures for long-lived assets 8,132 4,149 12,488 8,499  
Total          
Segment Reporting [Line Items]          
Interest income 198,575 195,759 394,027 386,224  
Interest expense (41,276) (43,831) (82,915) (85,225)  
Net interest income 157,299 151,928 311,112 300,999  
(Provision for) recapture of credit losses (13,006) (21,678) (35,489) (47,366)  
Non-interest income, net 33,023 30,431 65,190 59,948  
Non-interest expense:          
Compensation and employee benefits (41,176) (39,565) (82,523) (79,497)  
Occupancy, equipment and infrastructure costs (9,416) (9,544) (18,014) (19,278)  
Depreciation and amortization of premises and equipment (4,857) (5,085) (9,677) (10,171)  
Electronic banking charges (12,229) (12,276) (20,834) (21,946)  
Information technology expenses (7,117) (6,678) (13,714) (12,966)  
Professional and service fees (4,839) (4,813) (11,053) (9,931)  
Loan servicing and clearing expenses (2,497) (2,172) (5,061) (4,406)  
Amortization of other intangibles assets (231) (289) (462) (577)  
Intersegment expenses 0 0 0 0  
Other (20,470) (14,380) (36,197) (29,482)  
Total non-interest expense (102,832) (94,802) (197,535) (188,254)  
Income before income taxes 74,484 65,879 143,278 125,327  
Income tax expense (15,707) (14,078) (30,564) (27,954)  
Net income 58,777 51,801 112,714 97,373  
Total assets 13,532,107 13,517,666 13,532,107 13,517,666  
Expenditures for long-lived assets 8,132 4,149 12,488 8,499  
Total | Banking          
Segment Reporting [Line Items]          
Interest income 163,741 158,778 323,519 313,805  
Interest expense (31,815) (35,426) (62,863) (69,956)  
Net interest income 131,926 123,352 260,656 243,849  
(Provision for) recapture of credit losses (13,010) (21,678) (35,489) (47,368)  
Non-interest income, net 23,016 21,300 46,039 42,000  
Non-interest expense:          
Compensation and employee benefits (38,318) (36,962) (76,778) (73,748)  
Occupancy, equipment and infrastructure costs (9,261) (9,335) (17,721) (18,875)  
Depreciation and amortization of premises and equipment (4,844) (5,068) (9,643) (10,136)  
Electronic banking charges (12,229) (12,276) (20,834) (21,946)  
Information technology expenses (7,067) (6,636) (13,627) (12,875)  
Professional and service fees (3,832) (3,935) (8,164) (8,358)  
Loan servicing and clearing expenses (1,908) (1,705) (3,764) (3,281)  
Amortization of other intangibles assets (231) (289) (462) (577)  
Intersegment expenses 1,062 975 2,096 1,805  
Other (19,814) (13,866) (34,901) (28,465)  
Total non-interest expense (96,442) (89,097) (183,798) (176,456)  
Income before income taxes 45,490 33,877 87,408 62,025  
Income tax expense (15,651) (14,037) (30,455) (27,845)  
Net income 29,839 19,840 56,953 34,180  
Total assets 10,146,471 10,007,703 10,146,471 10,007,703  
Expenditures for long-lived assets 8,132 4,149 12,488 8,498  
Total | Wealth Management          
Segment Reporting [Line Items]          
Interest income 7 6 12 11  
Interest expense 0 0 0 0  
Net interest income 7 6 12 11  
(Provision for) recapture of credit losses 0 0 0 0  
Non-interest income, net 9,954 9,129 19,098 17,946  
Non-interest expense:          
Compensation and employee benefits (2,554) (2,320) (5,119) (5,191)  
Occupancy, equipment and infrastructure costs (135) (191) (259) (369)  
Depreciation and amortization of premises and equipment (9) (12) (19) (25)  
Electronic banking charges 0 0 0 0  
Information technology expenses (49) (42) (86) (97)  
Professional and service fees (953) (825) (1,672) (1,467)  
Loan servicing and clearing expenses (451) (337) (1,024) (927)  
Amortization of other intangibles assets 0 0 0 0  
Intersegment expenses (594) (570) (1,179) (1,090)  
Other (522) (390) (1,000) (763)  
Total non-interest expense (5,267) (4,687) (10,358) (9,929)  
Income before income taxes 4,694 4,448 8,752 8,028  
Income tax expense 0 0 0 (17)  
Net income 4,694 4,448 8,752 8,011  
Total assets 40,520 40,323 40,520 40,323  
Expenditures for long-lived assets 0 0 0 1  
Total | Treasury          
Segment Reporting [Line Items]          
Interest income 34,827 36,975 70,496 72,408  
Interest expense (9,461) (8,405) (20,052) (15,269)  
Net interest income 25,366 28,570 50,444 57,139  
(Provision for) recapture of credit losses 4 0 0 2  
Non-interest income, net 53 2 53 2  
Non-interest expense:          
Compensation and employee benefits (304) (283) (626) (558)  
Occupancy, equipment and infrastructure costs (20) (18) (34) (34)  
Depreciation and amortization of premises and equipment (4) (5) (15) (10)  
Electronic banking charges 0 0 0 0  
Information technology expenses (1) 0 (1) 6  
Professional and service fees (54) (53) (1,217) (106)  
Loan servicing and clearing expenses (138) (130) (273) (198)  
Amortization of other intangibles assets 0 0 0 0  
Intersegment expenses (468) (405) (917) (715)  
Other (134) (124) (296) (254)  
Total non-interest expense (1,123) (1,018) (3,379) (1,869)  
Income before income taxes 24,300 27,554 47,118 55,274  
Income tax expense (56) (41) (109) (92)  
Net income 24,244 27,513 47,009 55,182  
Total assets 3,345,116 3,469,640 3,345,116 3,469,640  
Expenditures for long-lived assets 0 0 0 0  
Eliminations          
Segment Reporting [Line Items]          
Interest income (1,425) (1,412) (2,751) (2,655)  
Interest expense 1,425 1,412 2,751 2,655  
Net interest income 0 0 0 0  
(Provision for) recapture of credit losses 0 0 0 0  
Non-interest income, net 0 0 0 0  
Non-interest expense:          
Compensation and employee benefits 0 0 0 0  
Occupancy, equipment and infrastructure costs 0 0 0 0  
Depreciation and amortization of premises and equipment 0 0 0 0  
Electronic banking charges 0 0 0 0  
Information technology expenses 0 0 0 0  
Professional and service fees 0 0 0 0  
Loan servicing and clearing expenses 0 0 0 0  
Amortization of other intangibles assets 0 0 0 0  
Intersegment expenses 0 0 0 0  
Other 0 0 0 0  
Total non-interest expense 0 0 0 0  
Income before income taxes 0 0 0 0  
Income tax expense 0 0 0 0  
Net income 0 0 0 0  
Total assets (1,377,535) (1,286,156) (1,377,535) (1,286,156)  
Expenditures for long-lived assets $ 0 $ 0 $ 0 $ 0