Segment Reporting (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	$ 347,059	$ 329,893	$ 327,630
Provision for (recovery of) credit losses	4,557	(11,916)	12,054
Other Income (Loss) and Security Gains	135,935	129,944	125,664
Noninterest Expense	297,978	283,518	286,595
Income taxes	32,108	34,290	26,722
Net Income (Loss) Attributable to Parent	148,351	153,945	127,923
Total assets	9,854,993	9,560,254	9,279,021
Total loans	7,141,891	6,871,122	7,177,785
Total deposits	8,234,715	7,904,528	7,572,358
Depreciation, Amortization and Accretion, Net	13,819	13,267	10,814
Other Noninterest Expense	284,159	270,251	275,781
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	180,459	188,235	154,645
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	1,250	1,250	1,250
Income taxes	0	0	0
Total assets	(3,042)	(1,413)	(1,028)
Total deposits	(299,993)	(254,060)	(250,965)
Depreciation, Amortization and Accretion, Net	0	0	0
Other Noninterest Expense	0	0	0
Operating Segments
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	350,646	328,398	326,375
Income taxes	33,110	37,615	27,125
Total assets	9,815,951	9,538,217	9,236,915
Total deposits	8,534,320	8,157,720	7,820,983
Depreciation, Amortization and Accretion, Net	13,819	13,265	10,803
Other Noninterest Expense	269,851	253,413	258,135
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	(4,837)	245	5
Income taxes	(1,002)	(3,325)	(403)
Total assets	42,084	23,450	43,134
Total deposits	388	868	2,340
Depreciation, Amortization and Accretion, Net	0	2	11
Other Noninterest Expense	14,308	16,838	17,646
Pnb Segment [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	350,646	328,398	326,375
Provision for (recovery of) credit losses	5,834	(8,554)	30,813
Other Income (Loss) and Security Gains	115,211	126,802	124,231
Noninterest Expense	283,670	266,678	268,938
Income taxes	33,110	37,615	27,125
Net Income (Loss) Attributable to Parent	143,243	159,461	123,730
Total assets	9,815,951	9,538,217	9,236,915
Total loans	7,141,362	6,868,935	7,165,840
Total deposits	8,534,320	8,157,720	7,820,983
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	176,353	197,076	150,855
Other Segments [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	(3,587)	1,495	1,255
Provision for (recovery of) credit losses	(1,277)	(3,362)	(18,759)
Other Income (Loss) and Security Gains	20,724	3,142	1,433
Noninterest Expense	14,308	16,840	17,657
Income taxes	(1,002)	(3,325)	(403)
Net Income (Loss) Attributable to Parent	5,108	(5,516)	4,193
Total assets	39,042	22,037	42,106
Total loans	529	2,187	11,945
Total deposits	(299,605)	(253,192)	(248,625)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	$ 4,106	$ (8,841)	$ 3,790